Recover your wifi password,only need use thisapp,if you modem has the default password you can use this app torecover the passwords.Never lose your wifi password againthis app only works for default password in some modems.this is not for hacking wifi free networks, neither for free wifi,its for recovery purposes.support next networksWLAN_XXXX, JAZZTEL_XXXX, WLAN_6X, YaCom_6X,Megared-XXXX,AXTEL-XXXX,, InterCable6X, InterCableXXXX, INFINITUM6X,INFINITUMXXXX, MAXCOMXXXX, mega cabledo not use in wrong way, the app can change your wifisettings.This app can turn on your wifithis app its like wifi hacker prank, or wifi hack joke, butfunctional.

Browse, download, upload, delete, copy, stream and manage files viaWiFi!!

WiFi FTP Turns your Android Phone/Pad/TV intoaWireless FTP Server. You can now copy multiple files, folders,orentire hard drives to your Phone and access thisinformationanywhere. Leave your USB keys behind, your Android Phonecan do allthat and MORE!Connect and share everything among phones, save you timeandeliminate the need of USB data cable for file transfer.Already supported encoding- UTF8- GBK(GB2312)- BIG5- ISO 8859-9 (Turkish)- ISO 8859-1 (Portuguese)- The fewer cables to carry the better- The computer doesn't need to have drivers it doesneedinstalled- Compatible with Windows Explorer and other FTP client tools(suchas FileZilla)- No mobile data plan impactWiFi FTP lets you:- COPY Files- VIEW Files- BACKUP FilesAll you need to do is:1. Start WiFi FTP on your Phone.2. Click the ON button3. Connect to supplied IP using ANY ftp client (inc Explorer/Finder / FileZilla)[PC] Recommend Client: FileZillalink:https://filezilla-project.org[PC] Other Supported FTP Client:Mac OS: FireFTP / CuteFTP / Transmit / Yummy / InterachyWindows: FireFTP / CuteFTP / SmartFTP / WinSCP / CyberduckLinux : FireFTP / VirgoFTP / GFTP / GoFTPThat's it. Now you have all your documents, file, photo,movies,music, homework, ANYTHING on your phone!

説明【対応OS・対応機種】・Android™ OS2.1以上・12夏～13夏モデルまでのドコモ スマートフォン／タブレット※Android™ OS5.0以上には対応しておりません。また、2014夏モデル以前の機種をAndroid™OS5.0以上にバージョンアップすると、本アプリは正常に機能しなくなる場合がございます。SIM認証にてdocomoWi-Fiに接続してください。※「ドコモ らくらくホン」シリーズ、「ドコモ キッズ・ジュニア」シリーズのAndroid端末は対応しておりません。【注意事項】・docomo Wi-Fiへの接続にはご契約が必要です。　・（プリインストールされている）一部の機種ではアンインストールすることはできません。・本アプリは一部のdocomoWi-Fiエリア(IEEE802.1x認証方式のみに対応しているエリア、SSIDが自動検出されないエリア)ではご利用になれません。・お客様がお使いの無線LANルーター（＝自宅Wi-Fi）への接続設定も可能ですが、設定する自宅Wi-Fiはセキュリティキーのある無線LANルーターを推奨致します。・設定メニューの「Wi-Fi電波表示」をOFFにするとウィジェトでの接続/切断と同時に、本体のWi-FiのON/OFFを行うことができます。・ご利用機種本体の設定によって本体設定によって画面OFF時にWi-Fiが切断される場合があります。本体のWi-Fi詳細設定内のスリープ設定をご確認の上、本アプリをご利用下さい。・自宅Wi-Fi設定の「らくらくQRスタート」でカメラ機能を利用するため、インストール時にハードウェアの制御(写真と動画の撮影)の許可を頂いております。・「ワンタッチ接続モード」は、接続および切断時に、本体のWi-Fi設定に対してSSID/セキュリティキーの追加/削除を行っています。※追加/削除するSSID/セキュリティーキーは、「docomoWi-Fi」と本アプリに設定頂いた「自宅Wi-Fi」のみ。「自動接続モード」では、本体のWi-Fi設定に対してSSID/セキュリティキーの削除は行いません。サービスの詳細・本アプリの使用方法等については、下記サイトをご確認下さい。http://www.nttdocomo.co.jp/service/data/docomo_wifi/※デベロッパー情報にあるお問い合わせメールアドレス宛には空メールをお送りください。自動応答により、お問い合わせフォームへのURLをお送り致します。Description[Corresponding OS · Compatible models]· Android ™ OS2.1 or more· 12 DoCoMo smartphone / tablet until summer to 13 summermodelsIt does not correspond to the Android ™ OS5.0 or more ※. Also, whenyou upgrade the model of the 2014 summer model previously Android ™OS5.0 or more, this app there are times when it will not functionproperly. Please connect to the docomo Wi-Fi at SIMauthentication.※ "DoCoMo Raku-Raku PHONE" series, "DoCoMo Kids Junior" series ofAndroid terminal is not supported.[Notes]· Docomo is your contract is required to connect to Wi-Fi.· (Pre-installed) it can not be uninstalled in some models.• This application is not accustomed to (only in areas thatsupport, SSID is automatically detected are not area IEEE802.1xauthentication method), the available part of the docomo Wi-Fiarea.· Customers but is also possible connection settings to yourwireless LAN router (= home Wi-Fi), home Wi-Fi to be setrecommended wireless LAN router with security key.- At the same time the "Wi-Fi radio waves Display" in the settingmenu When you OFF the connection / disconnection at the U ~ ijeto,you will be able to carry out the ON / OFF of the Wi-Fi of thebody.• Depending on available models body set There is a case where thescreen is OFF Wi-Fi is cleaved by the body set. Check on the sleepsetting of Wi-Fi details within the set of the body, please usethis app.-Home "Easy QR start" of the Wi-Fi settings to take advantage ofthe camera function, we have gotten the permission of control ofthe hardware at the time of installation (shooting photos andvideos).- "One-touch connection mode", at the time of connection anddisconnection, it is the Add / Remove SSID / security key for theWi-Fi configuration of the body.※ SSID / security key that you want to add / delete, "docomo Wi-Fi"and gotten set in this app "home Wi-Fi" only. In the "automaticconnection mode", but it does not delete the SSID / security keyfor the Wi-Fi configuration of the body.For information about how to use such services details this app,please check the following site.http://www.nttdocomo.co.jp/service/data/docomo_wifi/※ Please send a blank e-mail to the inquiry mail address is inthe developer information.The automatic response, we will send you a URL to the inquiryform.

WiEye is a FREE 802.11 WiFi Analyzer for Android. WiEye can beusedfor wireless site surveys, wifi scanning, and wirelessdiscovery.It reports the Name, BSSID, Signal Strength (dBm),Channel, andFrequency of all access points within range. It alsographs thisdata so you can see WiFi congestion for each availablechannel. Byusing this WiFi scanner, you are helping support theSouthernMethodist University wireless technology research grouplearn moreabout wireless signals in current use across the worldand developmore efficient protocols and algorithms. We hope thatyou findWiEye as a useful application for your wireless scanningneeds.Alongside the application, we collect usage statistics fromwillingparticipants to be used as anonymized performancecharacteristicsof wireless networks in many cities around the worldas well as theuser's context (driving, sitting, standing, etc.)when the sniffingis performed. The data will contribute to a globalpicture ofwireless networks and their performance. We offer WiEyefree ofcharge in the hopes that there would be a large user basefor theuser study. Your privacy is very important to us.Accordingly, wehave developed this privacy policy in order for youto understandhow we collect, use, communicate and disclose and makeuse of usagestatistics. The following outlines our privacy policy.- Before orat the time of collecting usage statistics, we willdisassociatethe measured data from the user's personalidentification. - Wewill collect and use of usage statistics solelywith the objectiveof fulfilling those purposes specified by us andfor othercompatible purposes, unless we obtain the consent of theindividualconcerned or as required by law. - We will only retainusagestatistics as long as necessary for the fulfillment ofthosepurposes. - We will collect usage statistics by a lawful andfairmeans and, where appropriate, with the knowledge or consent oftheindividual concerned. - A user's location should be relevant tothepurposes for which it is to be used, and, to the extentnecessaryfor those purposes, should be accurate, complete, andup-to-dateand without regard to the person's identity. - We willprotectpersonal information by reasonable security safeguardsagainst lossor theft, as well as unauthorized access, disclosure,copying, useor modification. - We will make readily available tocustomersinformation about our policies and practices relating tothemanagement of personal information.

You know the situation: You're anywhere,needinternet access and got lots of open wifi hotspotswithinreach.Trying each hotspot by hand? No!!!WiFi Internet Finder automatically connects to one aftertheother wifi hotspot and tries to get internet access for you.If a hotspot providing internet access was found, theappimmediately stops the checking process and you can startsurfing the internet.*Note*-Only use the internet if you're sure that the hotspotsowneragrees!-Don't use this app for bad / illegal purposes!*This is the full & ad-free version*

Global free Wi-Fi database, 3 million freehotspots.Features:✓ Map of nearby free Wi-Fi hotspots✓ Foursquare and WifiMapper comments - get more information aboutthe hotspot venue✓ Help improve the database - tell the community about theWi-Fi✓ View a history of all the wifi points you’ve connected to and seehow well they performed (Android only!)✓ Login with email or Google+ to comment, classify hotspots✓ Filter hotspots by wifi type (free, paid), or place type (eg.coffee shot hotspots)✓ Help crowdsource: by using the app you help map more free wifipointsJoin the world's largest Wi-Fi community!Save on roaming when travelling by going to free hotspots in everymajor city in the world.Smaller towns and rural areas have less data. Use the app andhelp fill the maps! Maps refreshed weekly, but we're moving todaily. All the data is crowdsourced from users of WifiMapper andOpenSignal.Find nearby Wi-Fi hotspots and save on data. WifiMapper can tellyou what kind of venue it is and even if they have good coffee -and you can share your comments!What we’re working on (a sneak peek into the future! NOTE:these features are not currently in the app)These are the features we’re building now so get ready for:★ Password sharing (not yet in app!) - a way of sharing passwordssecurely, get access to password protected hotspots without havingto type. For the moment you can share passwords to public free wifiin the comments★ Full offline maps for cities, for now the app caches recentlyviewed hotspots so you can look for wifi, turn off data and stillbe able to see the hotspots you found★ Leaderboards to brag about how many Wifi points you havediscovered, you can’t see this information yet but the edits andcomments you make now will count to the totals. Getcontributing!★ Tell us what else you'd like.Use WifiMapper to avoid expensive roaming and data usage charges orslow internet at home. Getting free Wi-Fi has never been soeasy!WifiMapper maps the best free hotspots nearby (from restaurants tolibraries to coffee shops and cafes). The details page gives yourelevant information on the hotspot and its location in addition tocomments from the community. The list of the hotspots presented isbased on our own recommendation algorithms - so we need yourpatience and collaboration to correct the status of Wi-Fi networkswhen you see errors! Every correction you make improves WifiMapperfor everyone!A special thanks to all of our 3000 beta testers. You’re allawesome, keep the feedback coming because WifiMapper couldn’t bewhere it is today without you.WifiMapper can show you the best hotspots in any major city aroundthe world, great for saving on roaming fees and keeping costs downwhen you travel. We also spend a lot of time working in Cafes andso we built WifiMapper to help find new cool spots with Wi-Fi inyour local area, not just abroad! Share your photos with no worryabout data charges using WifiMapper to have access to free Wifianywhere you go, all visible on a local map. This app is dedicatedto everyone who loves free cafe wifi like we do!We have mapped Wifi hotspots in almost every city in the world,here are our top 25 cities:1. Jakarta2. Sao Paulo3. Buenos Aires4. Bangkok5. Kuala lumpur6. Rio de Janeiro7. New Delhi8. Mexico City9. Milan10. Moscow11. London12. Paris13. Rome14. Riyadh15. Los Angeles16. Ho Chi Minh City17. Hanoi18. Lahore19. Bogota20. New York21. Berlin22. Madrid23. Casablanca24. St Petersburg25. ChicagoYour city not listed here? We definitely have Wi-Fi hotspots whereyou live but you can help us to add more by joining the WifiMappercommunity and tagging hotspots as free when you see them - or useWifiMapper when you travel to stay connected. Never pay for Wi-Fiagain when there’s a cafe just around the corner!Built with love & code by OpenSignal.

With a hundreds of millionsoffreeWi-Fihotspots keys shared by our users globally ,getfreewifianywhere! Based on your location, WiFi Free offersyounearbywifihotspot password. All wifi passwords shared byrealpeoplearoundthe world and the availability will beautomaticallydetectedbyWiFi Free.Wi-Fi Free Function：-Free wifiBased on your location, WiFi free offers younearbywifihotspotpassword within 5 kilometers.-Easy to findYou can take the initiative to find the wifihotspotyouareinterested in area such as cafe, hotel, city,country.-AvailableAll wifi passwords are shared by users, and theavailabilitywillbeautomatically detected by WiFi Free.-Around the worldNow available wifi password over ten million, allovertheworld,including the USA, Canada, Mexico, Brazil,America,Europe,Asia,Russian and all former USSR Countries, MiddleEast,Oceaniaandother countries and regions.-SmartUsing the reminder function for a wifi hotspot, WiFiFreewillremindyou, when the wifi hotspot is available.-SecurityWiFi Free will never initiatively record anywifihotspotinformationon your phone unless you initiatively shareaWiFihotspotpassword.

Recover your keys for your wifi network.

This simple app can help you increase thestandby time of your device: WiFi Automatic automaticallydisable your WiFi radio when you don't need it and thereby lowersthe battery consumption.You can also specify to automatically turn on WiFi again, if youturn on your device or when you enter a specified location(requires a cell radio and therefore does not work on WiFi-onlytablets!). Also, the app can regularly scan for available networksto connect to and re-disable WiFi if no suitable network is found.This way, you are always connected to your WiFi network when usingthe device.WiFi Automatic is open source:https://github.com/j4velin/WiFi-AutomaticA WiFi connection generally uses less power than a mobile dataconnection, so on your phone, it makes sense to keep the WiFi radioactive, whenever a WiFi network is in range--------------------Permissions:RECEIVE_BOOT_COMPLETED - is required to start the service againwhen rebooting your deviceThe following permissions are required to observe and change theWiFi state:CHANGE_WIFI_STATEACCESS_NETWORK_STATEACCESS_WIFI_STATEThe following permissions are required to the "turn on WiFi whenentering these locations" feature:INTERNETWRITE_EXTERNAL_STORAGEACCESS_COARSE_LOCATIONACCESS_FINE_LOCATIONBILLING

This is an application to create a shortcut,which comes from the open source application anycut. Easy one-touchdialing, a key to send a short message. And you can create ashortcut to any application to the desktop. Try it, maybe you'lllike it....

NetLoop is formerlyknownasSimpleAndroid ServerThis app contains a Proxy Server and aFreeVPN.The VPN is not a full featured VPN. it is notprovidedforsecuritybut for tunneling purposes.if you are using NetLoop's proxy serveroptionpleasemakeremove any existing proxy server address inyourdevice'sAPNsettings. Failure to do this will cause Some ofyourapps not togothrough the VPNVPN features:• HTTP request Compression.•Ability to modify TCP connection parameters.• Ability to use hotspot over VPN ( Requires root )•Ability to use multiple concurrent connections to theVPNserversforthe best Network usage experienceLocal server features:•modify outgoing requests.•specify alternate proxy servers to send a request through•provide alternate headers and ability to stripheadersfromincominghttp responses•ability to choose number of connections to be maintainedbytheapp(good for power management)•ability to share configurations throughanyfiletransfermethod.•System wide proxy serviceif you are to use this app with the proxyserverfeature,makesure that the device's proxy serverfeatureisdisabled:.to use a received config.json fileasthecurrentsetting:•locate the received file using any file manager ofyourchoice•open the share menu of the file manager and select"usefileasconfig"OR•Launch NetLoop and use Load ConfigThe Profiles Feature lets youeasilyswitchbetweenconfigurations when using NetLoopEnjoy!!.

Convivium, l’applicazione ENGIE pensata per semplificare la vitanelcondominio! Convivium gestiste, per l’amministratore e icondòmini:• SEGNALAZIONI TECNICHE: facilita la gestione dellerichieste diintervento, aggiornando i condòmini e l’amministratorein temporeale sullo stato di avanzamento • MESSAGGIAMMINISTRATORE:semplifica la comunicazione tra condomino eamministratore suscadenze, assemblee e molto altro • ARCHIVIODOCUMENTI: raccoglie idocumenti importanti del condominio, comeverbali e preventivi •CONTATTI UTILI: gestisce la rubrica con icontattidell’amministratore, dei condòmini e dei fornitori delcondominio,come l’idraulico e l’elettricista • BACHECA SOCIAL:crea unacommunity tra i condòmini per scambiare informazioni eavvisi utiliL’applicazione è dedicata agli amministratori chegestisconocondomini clienti ENGIE e a tutti i loro condòmini.ACCESSOCONDÒMINI: per accedere è necessario seguire la proceduradiregistrazione condòmino, indicando come codice condominio ilCodiceFiscale del condominio ACCESSO AMMINISTRATORI: per accedereènecessario utilizzare le credenziali impostate per lapiattaformaweb Si segnala che la grafica e la navigabilità dell’appConviviumsono ottimizzate per la navigazione da smartphone. Ituoisuggerimenti e le tue segnalazioni sono importanti per noi.Perqualsiasi necessità puoi chiedere supporto scrivendoall’indirizzoemail [email protected], saremo felici diaiutarti.

Need to re-connect your new device to WiFinetwork, but forgot your password? Want to share a WiFi password ofrandom characters with your friend?Use FREE Wifi Password Recovery to backup all WiFi passwords onyour device, and restore it when you need them with just one click!Share with friends through SMS or email. Yes, just that easy!FREE Wifi Password Recovery features:■ LIST, BACKUP & RESTORE all network's (WiFi) password savedon your device!■ Show SSID and Password on fullscreen (for easy viewing andsharing with others)■ Copy WiFi Password to Clipboard (to be able to pasteanywhere)■ Show QR Code (to another device scan and access thenetwork)■ Share password through SMS or EmailPlease Note that FREE Wifi Password Recovery:① only works on rooted devices (needs super-userpermissions).② is not a WiFi password cracker. NOT intended to crack WiFinetworks.③ needs previous access to WiFi networks with your device toretrieve passwords.❐ Please understand that FREE Wifi Password Recovery is a freeapp and contains ads to support develop cost. For ads free app, wehave a paid version - check out in Play Store:http://goo.gl/elnAHS❐ Why FREE Wifi Password Recovery only works on a rooteddevice?Because your device stores WiFi passwords when you connect to a newWiFi network. You are not able to access the passwords and retrievethem unless you have super-user permissions. Checkout here for moreinformation on root: http://www.androidcentral.com/root❐ Please don’t hesitate to contact([email protected]) for any issues you may have; and dogive us 5 stars if you like us! Thanks & enjoy!

Say goodbye to Android APK OBB Installing error problem, XAPKInstaller makes that easier and faster than ever.• Scan and preview all .apk file on your phone and SD Card• Delete or install APK, XAPK ( APK with cache data or obb file)automatically• Download XAPK, APK free online with your Android phone andtabletXAPK Installer for PC is available that allows you to install.apk files from Windows XP, Vista, 7, 8. 8.1 to Android devices.Learn More: http://apkpure.com/apk-install.htmProblems downloading or installing APK with XAPK Installer? Seehttp://apkpure.com/xapk.htmStill need more help? Please tell us more about the issue onFacebook. https://www.facebook.com/apkpure

Scan for and recover deleted files from memorycards and internal storage on rooted* devices.Without a jailbreak/root* access, Undeleter can only scan appcaches for images. READ BELOW FOR INFO ABOUT ROOT.For free, the app will restore all supported image file typesand all types of data, including SMS, call logs and WhatsApp orViber conversations. It will also shred and secure delete.Unlock it to recover other supported file types, remove ads andenable background scanning.*ROOT/SUPERUSER PERMISSIONS require that you modify theoperating system on your device, visit this website for moreinformation: http://www.androidcentral.com/rootApp caches can contain images that would not otherwise bediscoverable: you may find photos that were shared with you onsocial media but you never opened, or lower quality copies ofimages you have now or have deleted in the past. They may alsocontain images that have been preloaded by your browser or otherapps on your device - even images of people you don't know. Theycan be filtered out using "Hide extant files".File types: Journal scanning can discover files with anyconceivable extension. Essentially these files are still on yourvolume with their data in allocated sectors. Journal scan is onlyavailable on EXT4 and derived file systems.Deep scan heuristically scans for and recovers the following typesof files: BMP, JPEG/JPG, PNG, MNG, JNG, GIF, MP4, AVI, MKV, MP3,OGG, OGM, WAV, FLAC, AMR, MP4A, PDF, SXD, SXI, SXC, SXW, ODT, ODG,ODS, ODP, DOCX, XLSX, PPTX, ZIP, JAR, APK, EPUB.Data scanning is available for a select number of apps, includingthe system phone and SMS applications. Data will be recovered inthe form or HTML files for WhatsApp and Viber, as we cannot mergethird-party catalogs.Shred/secure delete: Files found on free disk areas can be erasedpermanently in bulk using the Shred function. You can also use thesystem-wide Share menu to securely erase files directly through anyother app, for example by opening the gallery, selecting a numberof images, pressing the Share button and selecting Securedelete.ACCOUNT - needed for Google Drive and Dropbox uploadCALL/SMS - needed for app data scanner - deleted SMS and calllogsLOCATION - for ads

The original CM Security upgraded to thewhole new Security Master Antivirus&VPN(by CM, Cheetah Mobile)and redefined the scalp of Phone Security: protects not only yourphone but also your privacy. Instead of providing all the popularfeatures, Security Master Antivirus&VPN(by CM) introducedIntelligent Diagnosis to detect your phone status and advise neededsolution, including Antivirus, Junk Clean, and Phone Booster(Battery Saver, and CPU Cooler) in time. Furthermore, westrengthened the protection of privacy by creating a shield for allonline activities through SafeConnect VPN.★SafeConnect VPNSecurity Master Antivirus&VPN(by CM) presents the mosteasy-to-use free VPN, proxy & unblock solution. Apart fromother VPN, SafeConnect VPN partners with “Hotspot Shield Free VPNProxy” and was designed for everyone. SafeConnect VPN establishes asecured cyber environment as you need to block out hackers. WithSafeConnect VPN, you can apply virtual location to enhance securityand freely access favorite contents. Security MasterAntivirus&VPN(by CM) now protects not only your device, but theprotection extends to online data transmission to prevent leak ofonline banking information, private messages, and browsing history.(Will be available worldwide soon.)★Intelligent DiagnosisOur famous big button design upgraded to intelligently diagnoseyour most needed solution. All solutions to keep your phone safe,clean, and optimized like a new one, including battery.Antivirus - Security Master Antivirus&VPN(by CM) equips thecertified #1 antivirus engine. It detects 100% of virus &malware by customized scan and removes virus & malware. Itprotects phone and also your personal information against malware,spyware, and hackers.Junk Clean - Phone stores junk files automatically from time totime. Security Master Antivirus&VPN(by CM) detects this issueand frees storage when needed. One tap to clean cache & junkfiles at once. The smartest way to clean and optimize phone.Phone Boost, Battery Saver, and CPU Cooler - Your phone can nothave the best performance if it stays at a high temperature or highmemory usage. Especially when charging battery and playing games,it watches out phone & battery and keeps your phone cool, fast,and saves more battery life.★Message SecurityWorry about others peeping your message notifications? SecurityMaster Antivirus&VPN(by CM) hides notifications timely toprotect your privacy by Message Security. It gathers all chatnotifications into one and makes them easier to read &manage.★AppLockSecurity Master Antivirus&VPN(by CM) protects the privacy ofapps by AppLock. You can lock anything you want to protect, such asBluetooth & Wi-Fi switches, incoming calls, recent apps,settings, photos, WhatsApp, or any apps you choose. Furthermore,the preview of notifications can be also locked so that no one cansee which apps you are using or who you are chatting with.With Applock, you can lock apps with a pattern, PIN code, orfingerprint. Fingerprint lock is supported on Samsung or Androiddevices 6.0 and above that are equipped with fingerprint sensors.You can also customize the re-lock time to re-lock at device screenoff so that no need to unlock each time you launch an app.Intruder Selfie - Security Master Antivirus&VPN(by CM) protectsapps privacy from snoopers. If someone tries to unlock your appwith a wrong password, the photo of the intruder will automaticallybe taken and the intruder alert will be sent to you by e-mail. Itkeeps your phone safe and further tells who the intruder is.Disguise cover - Security Master Antivirus&VPN(by CM) disguiseslock screen so that no one is aware of you are using AppLock whilekeeping your secret & privacy safe. You can protect yourprivacy without your parents, partner, or children knowing.Theme - You can choose style of lock screen from hundreds ofAppLock themes or customize with your photos.