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# Window System-specific Notes

Qt is a multiplatform GUI toolkit, so almost the entire API is the same on all platforms and window systems. If you wish to use platform-specific features, and still maintain a platform-independent source tree, you should protect the platform-specific code using the appropriate `#ifdef` statements (see below).

- Qt/X11
- Qt/Windows
  - Microsoft Visual Studio 2005 Deployment Issues
- Qt/Mac OS X
- Qt/Embedded

For information about which platforms are supported by Qt, see the Platform Notes. For information on distributing Qt applications, see Deploying Qt Applications.

## Qt/X11

When compiling for this platform, the macro `Q_WS_X11` is defined.

Not documented here. Please contact Trolltech Technical Support if you have queries.

Note: You must compile with both Xft and XRender support to get alpha transparency support for pixmaps and images. Configuring with XRender support only is not enough.

## Qt/Windows

When compiling for this platform, the macro `Q_WS_WIN` is defined.

Not documented here. Please contact Trolltech Technical Support if you have queries.

### Microsoft Visual Studio 2005 Deployment Issues

Executables compiled with Microsoft Visual Studio 2005 require a manifest file that points to the C and C++ runtime libraries that Qt and the application itself depend on. The manifest file is automatically generated for you, but it always needs to be located in the same directory as the application executable.

It is important to remember to deploy the manifest file when deploying an application.

Note: If you don't want to deploy your application with the .manifest file, you can embed the manifest in the executable as a resource with the `mt` command (distributed with Visual Studio 2005).

If you have further problems, please see the MSDN document, "Side-by-side Assemblies Reference".

## Qt/Mac OS X

When compiling for this platform, the macro `Q_WS_MACX` is defined.

- Qt/Mac issues

## Qt/Embedded

When compiling for this platform, the macro `Q_WS_QWS` is defined (the window system is literally the Qt Window System).

- Installation
- Qt/Embedded performance tuning
- Running Qt/Embedded applications
- Porting your applications to Qt/Embedded
- Font formats and definitions
- Character input (keyboard, pen, ...)
- Pointer handling (mouse, pen, ...)
- Reduce memory use with the feature definition file