$FUNCNAME$
  MRIGHTDOWN()
$CATEGORY$
  KEYBOARD/MOUSE
$SUMMARY$
   Determine the status of the right mouse button
$SYNTAX$
     MRIGHTDOWN() --> lIsPressed
$RETURNS$
     MRIGHTDOWN() returns true (.T.) if the mouse's right button is currently
     pressed; otherwise, it returns false (.F.) .
$SEEALSO$
  MLEFTDOWN()
$END$
