This message is sent to IPF by the application to request IPF-specific information, such as the current Instance handle, the active communication object window, the active window, or the group number of the current window.

param1
    USHORT  usselectionid  /*  What is being requested. */
    USHORT  usmessageid    /*  Type of window queried. */

param2
    PVOID   pvoid          /*  Varies, depending on value selected above. */

returns
    ULONG   rc             /*  Return code. */