# Tcl Windows API (TWAPI) 4.2
This is the release version of TWAPI 4.2.
* Project home page is at
http://twapi.sourceforge.net
* V4.2 documentation is at
http://twapi.magicsplat.com/v4.2
## Supported platforms
TWAPI 4.2 requires
* Windows XP (32-bit only) or later (32- or 64- bit)
* Tcl 8.5 or 8.6 (32- or 64-bit)
## Changes since 4.1
Major changes in this release are enhancements related to CryptoAPI and
certificate support.
For a complete list, including INCOMPATIBLE CHANGES, see
http://twapi.sourceforge.net/v4.2/versionhistory.html
## Distributions
TWAPI is distributed in multiple formats.
See
http://twapi.sourceforge.net/v4.2/installation.html for the details
and the pros and cons of each format.
## TWAPI Summary
The Tcl Windows API (TWAPI) extension provides
access to over 600 functions in the Windows API
from within the Tcl scripting language.
Functions in the following areas are implemented:
* System functions including OS and CPU information,
shutdown and message formatting
* User and group management
* COM client and server support
* Security and resource access control
* Window management
* User input: generate key/mouse input and hotkeys
* Basic sound playback functions
* Windows services
* Windows event log access
* Windows event tracing
* Process and thread management
* Directory change monitoring
* Lan Manager and file and print shares
* Drive information, file system types etc.
* Network configuration and statistics
* Network connection monitoring and control
* Named pipes
* Clipboard access
* Taskbar icons and notifications
* Console mode functions
* Window stations and desktops
* Internationalization
* Task scheduling
* Shell functions
* Windows Installer
* Synchronization
* Power management
* Device I/O and management
* Crypto API and certificates
* SSL/TLS
* Windows Performance Counters