Check if application is running under DesqView
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 Syntax

        GT_IsDesq() --> lIsDesqView

 Arguments:

      None

 Returns:

      A Logical value.

 Description:

      GT_IsDesq() can be used to see if your application is running
      under DesqView.

 Examples:

      if GT_IsDesq()
         ? "Running under DesqView"
      endif

 Source: ISDESQ.ASM

 Author:  David Pearson