When the operator chooses PF3 ("rotate furniture") the program branches
   here.  The Text (GTXS) function is used to prompt the operator to enter a
   rotation angle.  Then the Request valuator (GRQVL) function calls for
   input from the valuator device on the workstation:

          LOOP:
               UNTIL STATUS = 1
               REQUEST VALUATOR (wkid, 1, status, value)
          END LOOP