Macro: RUNPROGRAM

    #IFSAME !1 WAIT BACKGROUND
      #IF !0>3
        #ERROR 162 TOO MANY ARGUMENTS TO RUNPROGRAM !1
      #ELSE
          #IFSAME !1 WAIT
              !A [] $2CC !2 !3
            #ELSE // BACKGROUND
              !A [] $2CD !2 !3
            #ENDIF
      #ENDIF
    #ELSE
        // Number of args is checked by type checking of command for PIPE.
      #IFSAME !1 PIPE
          #IF !0<4
              RUNPROGRAM_PIPE !2 "" !3 !4 !5 !6 !7 !8 !9
          #ELSE
              RUNPROGRAM_PIPE !2 !3 !4 !5 !6 !7 !8 !9
          #ENDIF
      #ELSE // Plain RUNPROGRAM.
          #IF !0>2
              #ERROR 162 TOO MANY ARGUMENTS TO RUNPROGRAM
          #ELSE
                !A [] $2C0 !1 !2
          #ENDIF
      #ENDIF
    #ENDIF