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### Tk >> Tk C Procedures >> System-specific

System-specific
    Tk_CreateClientMessageHandler - associate procedure callback with ClientMessage type X events
    Tk_CreateGenericHandler - associate procedure callback with all X events
    Tk_FreeXId - make X resource identifier available for reuse
    Tk_GetHINSTANCE - retrieve the global application instance handle
    Tk_GetHWND - manage interactions between the Windows handle and an X window
    Tk_GetVRootGeometry - Get location and size of virtual root for window
    Tk_GetVisual - translate from string to visual
    Tk_HWNDToWindow - Find Tk's window information for a Windows window
    Tk_IdToWindow - Find Tk's window information for an X window
    Tk_InternAtom - manage cache of X atoms

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