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 RDDESCEND()
 Returns logical indicating READ systems descending status
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 Syntax
      RDDESCEND() -> <lDescend>
 Arguments
     None
 Returns
     <lDescend> which is .T. if the GET/READ system will descend
           to a lower level than the current one and is .F. if it
           will stay at the same level.
 Description
     This routine can be useful when a READ is performed in a VALID clause.
     It is the mouse equivalent of the keyboard test LASTKEY()=K_ESC.
 Examples
     IF RDDescend()
        <Check other gets>
     ENDIF

 Source: MOUSEGET.PRG

 Author: Leo Letendre