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. */