The following is a list of the categories of functions in the Windows application programming interface (API). For a list of functions in alphabetical order, see Functions in Alphabetical Order. For a list of functions by release, see Functions by Release.

• Application Recovery and Restart
• Atom
• Backup
• Bitmap
• Brush
• Button
• Caret
• Clipboard
• Clipping
• Color
• Combo Box
• Common Dialog Box
• Common Log File System
• Communication
• Console
• Coordinate Space and Transformation
• Cursor
• Debug Help Library
• Debugging
• Device Context
• Device Management
• Dialog Box
• Directory Management
• Disk Management
• Dynamic Data Exchange
• Dynamic Data Exchange Management
• Dynamic-Link Library
• Edit Control
• Error Handling
• Event Logging
• File Management
• Filled Shape
• Font and Text
• Handle and Object
• Hook
• Icon
• Input Method Manager
• Kernel Transaction Manager
• Keyboard Accelerator
• Keyboard Input
• Line and Curve
• List Box
• Mailslot
• Memory Management
• Menu
• Message and Message Queue
• Metafile
• Mouse Input
• Multimedia Class Scheduler Service
• Multiple Display Monitors
• Multiple Document Interface
• National Language Support
• Network Management
• Network DDE
• Painting and Drawing
• Path
• Pen
• Performance Counters
• Performance Logs and Alerts
• Pipe
• Power Management
• Printing and Print Spooler
• Process and Thread
• PSAPI
• Raw Input
• Rectangle
• Region
• Registry
• Resources
• Restart Manager
• Rich Edit Control
• Scroll Bar
• Service
• Static Control
• String
• Structured Exception Handling
• Synchronization
• System Information
• System Shutdown
• Terminal Services
• Text Object Model
• Thread Ordering Service
• Thread Pool
• Time
• Time Provider
• Timers
• Tool Help
• Transactional NTFS (TxF)
• Unicode and Character Set
• Uniscribe
• User Profiles
• Version Information
• Volume Management
• Wait Chain Traversal
• Window
• Window Class
• Window Procedure
• Window Property
• Windowless Rich Edit Control
• Windows Error Reporting
• Windows Networking

Build date: 5/7/2009