Display a CrossHair and Coordinates on the screen
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 Syntax

        GTCrossHair()

 Returns:

      NIL   -  Nothing.

 Description:

     This is a handy little function,  it allows you to move a crosshair
     cursor around the screen with the cursor keys; it tells you the
     current cursor position.   Useful for working out the coordinates of
     SAY/GET commands.

     Use the UP/DOWN/LEFT/RIGHT cursor keys  or  ESCAPE to get out.



 Examples:

      SET KEY K_ALT_X TO GTCrossHair()

 Source: GT_CROSS.PRG

 Author:  Brian Dukes