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  Name:     isbutton() - check if a mouse button has been pressed
  Usage:    <logical> = isbutton(<button>)
  Params:   int <button> : 0=left, 1=right, (2=middle PC mouse)
  Returns:  .T. if button pressed, .F. if not

 ---------------------------------- Example ---------------------------------

                 if .not. isbutton(1)
                      loop
                 else
                      mvar = m_row()
                 endif

  Note:     Isbutton() does not wait for a mouse click or keyboard press.
            It merely does a quick check. Useful for using inside loops
            for active updating of prompts. SET KEY TO works as well.
            If a key is pressed before the mouse button is clicked, the key
            value is stored in lastkey() and isbutton() returns .F.