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Windows USER

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In 32-bit versions of Windows, the 32-bit version of Windows USER is called user32.dll and is located in the System32 directory, while compatibility with 16-bit applications is provided by having a modified version of user.exe also present.
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In 64-bit versions of Windows, the 64-bit implementation of Windows USER is called user32.dll and is located in the System32 directory, while a modified 32-bit version (also called user32.dll) is present in the SysWOW64 directory.
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Windows are managed as a tree, with the desktop window at the root of the hierarchy. Child windows are usually (but not always) visually contained within their parents.
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is the basic unit of visual display and input in the Windows developer platform. All visual elements either have their own HWNDs or live as part of a larger
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By combining calls to Windows USER in the right way, a Windows application processes messages. The core Windows message loop (including calls to
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Gradually, as Windows has become larger and better factored, Windows USER has cooperated with other components to provide this functionality:
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application. Wherever USER would have drawn the desktop background before, a solid screen of the user's accent color is drawn instead.
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Applications and the operating system communicate with HWNDs using messages. A window message is the combination of a target
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Windows USER provides a large part of the core user experience for Microsoft Windows. Historically, it was responsible for:
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In 16-bit versions of Windows, Windows USER was implemented as a file called user.exe. The file extension here was a
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interface is a recommended replacement for the menu bar and context menus. It is provided by the UIRibbon component.
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Windows USER implements abstractions that are used to build Windows applications. These include
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Standard Visuals: Starting with Windows XP, visual elements are drawn by the Theming component.
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Developer functionality related to Windows USER is provided in the C header file winuser.h.
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when DWM is enabled, drawing of the mouse pointer is managed by it. However, starting in
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replaced Dynamic Data Exchange as the recommended model for inter program communication.
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Providing all the standard window management controls (such as close boxes or
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Comprehensive Reference on WOW64 Folders, Variables, Values and References
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Inter-program communication: Starting with Windows 3.1,
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Processing all user input from the mouse and keyboard
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that provides core functionality for building simple
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as a device-independent API for drawing primitives)
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Relevant discussion may be found on the 77:Learn how and when to remove this message 164:Providing of standard controls (such as 437: 398:, as Windows USER was in fact always a 2135:Next-Generation Secure Computing Base 271:Menu bar: Starting in Windows 7, the 7: 200:Drawing all standard visual elements 183:(short-cut keys, tab key processing) 1264:Distributed Transaction Coordinator 288:Windows Preinstallation Environment 259:Windows Preinstallation Environment 134:Causing windows to be drawn (using 1595:User Interface Privilege Isolation 341:also has a communication channel ( 14: 446:Programming Windows Fifth Edition 307:%SystemRoot%\System32\DWMInit.dll 2257: 2247: 2246: 253:theme is enabled. Starting with 20: 1324:Remote Differential Compression 469:, Addison-Wesley Professional, 426:Microsoft Windows library files 278:Desktop wallpaper: Starting in 158:Providing the standard Windows 2180:Windows System Assessment Tool 89:Component of Microsoft Windows 1: 1469:Open XML Paper Specification 1329:Remote Installation Services 537:Microsoft Windows components 266:Object Linking and Embedding 1621:Windows Subsystem for Linux 1580:Mandatory Integrity Control 1334:Windows Deployment Services 1131:Wireless Zero Configuration 297:Mouse pointer: Starting in 204:Inter-process communication 148:Window size and positioning 2311: 1723:Universal Windows Platform 1429:Kernel Transaction Manager 1414:Hardware Abstraction Layer 1111:Multimedia Class Scheduler 2242: 2175:Windows Services for UNIX 1560:Data Execution Prevention 1409:Graphics Device Interface 1299:Network Access Protection 918:Remote Desktop Connection 543: 444:Petzold, Charles (1998). 420:Graphics Device Interface 1540:Security and Maintenance 1484:Security Account Manager 1078:Windows XP visual styles 486:Windows Ribbon Framework 227:Controls: Starting with 193:background image (until 2285:Windows NT architecture 2125:Media Control Interface 1959:Help and Support Center 1575:Kernel Patch Protection 1339:System Resource Manager 1319:Remote Desktop Services 1314:Print Services for UNIX 1096:Service Control Manager 706:Windows Error Reporting 626:DirectX Diagnostic Tool 2105:Desktop Cleanup Wizard 1681:COM Structured storage 1382:Desktop Window Manager 1274:Windows Media Services 465:Chen, Raymond (2007). 247:Desktop Window Manager 126:Functionality and role 95:is a component of the 1733:Windows Mixed Reality 1404:Enhanced Write Filter 1254:Roaming user profiles 208:Dynamic Data Exchange 181:dialog box management 2014:Mobile Device Center 1964:Health & Fitness 1762:Solitaire Collection 1590:User Account Control 1585:Protected Media Path 1489:Server Message Block 1439:Logical Disk Manager 691:System Policy Editor 676:System Configuration 448:, Microsoft Press, 400:dynamic link library 314:Developer experience 45:its references and 39:improve this article 2160:Virtual DOS machine 1504:System Idle Process 1479:Resource Protection 1387:Portable Executable 1279:Active DRM Services 681:System File Checker 651:Performance Monitor 143:overlapping windows 55:support the article 2295:Windows technology 2290:Windows components 2165:Windows on Windows 1889:Backup and Restore 1701:Transaction Server 1419:I/O request packet 1259:Folder redirection 928:Speech Recognition 686:System Information 641:Management Console 325:(Handle to Window) 2272: 2271: 2198: 2197: 2155:Video for Windows 2110:Games for Windows 1979:Internet Explorer 1073:Windows Spotlight 716:Windows Installer 475:978-0-321-44030-3 467:The Old New Thing 454:978-1-57231-995-0 292:WallpaperHost.exe 108:window management 97:Microsoft Windows 87: 86: 79: 49:any that are not 2302: 2261: 2260: 2250: 2249: 2170:Windows SideShow 1949:Food & Drink 1843:Spider Solitaire 1783: 1676:ActiveX Document 1644:Active Scripting 1600:Windows Firewall 1555:Credential Guard 1234:Active Directory 1031:Indexing Service 661:Resource Monitor 656:Recovery Console 530: 523: 516: 507: 488: 483: 477: 463: 457: 442: 382: 378: 377:TranslateMessage 374: 362: 354: 344: 340: 336: 332: 324: 308: 293: 286:, except in the 284:Windows Explorer 116:input processing 100:operating system 82: 75: 71: 68: 62: 24: 16: 2310: 2309: 2305: 2304: 2303: 2301: 2300: 2299: 2275: 2274: 2273: 2268: 2238: 2206:Microsoft Store 2204: 2194: 2140:POSIX subsystem 2120:File Protection 2093: 2064:Program Manager 2049:Phone Companion 2039:Outlook Express 1989:Make Compatible 1919:Desktop Gadgets 1879:Anytime Upgrade 1862: 1774: 1747: 1738:Windows Runtime 1630: 1604: 1570:Family features 1528: 1353: 1309:DFS Replication 1220: 1135: 1126:Error Reporting 1082: 982: 858:Mobility Center 853:Movies & TV 747: 731:Windows Insider 621:Driver Verifier 616:Drive 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32:verifiability 27: 23: 18: 17: 2219:File Manager 2059:Photo Viewer 1994:Media Center 1954:Groove Music 1884:Address Book 1855: 1848: 1841: 1836:Purble Place 1834: 1827: 1820: 1813: 1806: 1801:Chess Titans 1799: 1792: 1779:Discontinued 1767: 1760: 1508: 1459:Ntoskrnl.exe 1367:Boot Manager 1359:Architecture 1249:Group Policy 1141:File systems 1041:Saved search 948:Sticky Notes 913:Quick Assist 841:Media Player 811:Feedback Hub 806:Fax and Scan 701:Task Manager 631:Event Viewer 611:Disk Cleanup 481: 466: 461: 445: 440: 408: 404: 393: 385: 370: 367:Message Loop 358: 347: 328: 317: 222: 129: 93:Windows USER 92: 91: 73: 64: 37:Please help 29: 2234:Minesweeper 2203:Spun off to 2024:MSN Dial-up 2019:Movie Maker 1924:Diagnostics 1874:ActiveMovie 1616:COMMAND.COM 1494:Shadow Copy 1349:Server Core 1189:Mount Point 1116:Shadow Copy 711:Windows Ink 2279:Categories 2214:DVD Player 2029:NetMeeting 1929:DriveSpace 1794:3D Pinball 1294:SharePoint 1058:Start menu 903:Phone Link 766:Calculator 721:PowerShell 582:Management 432:References 373:GetMessage 303:Windows 11 233:Windows XP 229:Windows 95 179:Providing 153:title bars 141:Obscuring 67:March 2022 53:or do not 2009:Messenger 2004:Messaging 1934:DVD Maker 1904:CD Player 1899:CardSpace 1850:Solitaire 1550:BitLocker 1545:AppLocker 1179:Hard link 1068:Task View 1046:Namespace 1016:ClearType 836:Messaging 821:Magnifier 786:Clipchamp 761:3D Viewer 355:(Message) 280:Windows 8 255:Windows 8 249:when the 217:Clipboard 195:Windows 8 59:talk page 43:verifying 2253:Category 2130:MS-DOS 7 2115:ScanDisk 2034:NTBackup 1914:Contacts 1894:Cardfile 1829:Hold 'Em 1808:FreeCell 1654:VBScript 1565:Defender 1533:Security 1519:Winlogon 1474:Registry 1088:Services 1021:Explorer 1006:AutoPlay 893:Paint 3D 878:OneDrive 868:Narrator 816:Get Help 771:Calendar 666:Settings 636:IExpress 414:See also 396:misnomer 174:Edit Box 170:List box 160:menu bar 120:controls 51:reliable 47:removing 2229:Mahjong 2150:Interix 2084:WinHelp 1984:Journal 1974:Imaging 1822:InkBall 1708:DirectX 1671:ActiveX 1659:JScript 1372:Console 1344:Hyper-V 1239:Domains 1063:Taskbar 1036:IFilter 1011:AutoRun 973:WordPad 968:Weather 883:OneNote 873:Notepad 796:Cortana 671:Sysprep 343:WNDPROC 191:desktop 2262:  2251:  2224:Hover! 2098:Others 2079:Travel 2074:Syskey 1857:Tinker 1815:Hearts 1743:WinUSB 1728:WinAPI 1713:Native 1524:WinUSB 1449:MinWin 1226:Server 1026:Search 938:Sports 908:Photos 898:People 776:Camera 473:  452:  273:Ribbon 206:using 166:button 2190:WinFS 2089:Write 1786:Games 1753:Games 1626:WoW64 1454:NTLDR 1444:LSASS 1377:CSRSS 1184:links 1159:exFAT 988:Shell 953:Store 943:Start 933:Skype 888:Paint 863:Money 791:Clock 738:WinRE 646:Netsh 584:tools 573:Games 422:(GDI) 2264:List 2145:HPFS 1909:Chat 1867:Apps 1769:Surf 1718:.NET 1686:DCOM 1514:WHEA 1509:USER 1499:SMSS 1289:WSUS 1269:MSMQ 1211:ReFS 1174:NTFS 1149:CDFS 1106:CLFS 1101:BITS 1001:Aero 978:Xbox 958:Tips 846:2022 831:Maps 826:Mail 801:Edge 753:Apps 548:APIs 471:ISBN 450:ISBN 379:and 361:HWND 339:HWND 335:HWND 331:HWND 329:The 323:HWND 251:Aero 189:The 30:The 2044:Pay 1944:Fax 1691:OLE 1666:COM 1649:WSH 1636:API 1397:DLL 1392:EXE 1304:PWS 1284:IIS 1244:DNS 1216:UDF 1204:EFS 1199:TxF 1169:FAT 1164:IFS 1154:DFS 743:WMI 353:MSG 172:or 136:GDI 41:by 2281:: 561:NT 556:9x 402:. 375:, 168:, 122:. 114:, 110:, 529:e 522:t 515:v 456:. 261:. 219:) 197:) 176:) 155:) 80:) 74:( 69:) 65:( 61:.

Index


verifiability
improve this article
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Microsoft Windows
operating system
user interfaces
window management
message passing
input processing
controls
GDI
overlapping windows
title bars
menu bar
button
List box
Edit Box
dialog box management
desktop
Windows 8
Inter-process communication
Dynamic Data Exchange
Clipboard
Windows 95

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