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 InterruptUnRegister()  Uninstalls a user defined GPFs controller
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   Syntax:              InterruptUnRegister() --> <lSuccess>

   Parameters:          None.

   Returns:

   <lSuccess>           A logical value indicating if the GPF controller
                        was properly uninstalled.

   Comments:            Though FiveWin has been extensively tested
                        against GPFs, we wanted to offer control over
                        a possible GPF offering so an opportunity to take
                        control to close all files and generating an
                        error.log file with info to detect the cause.

   Sample:              SAMPLES\\TestTool.prg

   Source code:         SOURCE\\WINAPI\\ToolHelp.c