Get the location of the program's PSP.
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 Syntax

        GT_PspSeg() --> nPSPSegment

 Arguments:

      None.

 Returns:

      The location of the program's PSP.

 Description:

      GT_PspSeg() can be used to gain access to your programs PSP.

 Examples:

      // Display the location of the PSP.

      ? GT_PspSeg()

 Source: PSPSEG.C

 Author:  Dave Pearson