Performing operations specific to command procedures.

  @                 Describes how to invoke command procedures.
  Lexical           Describes functions that can be used in expressions.
  Specify           Describes valid values and expressions.
  Symbol_Assign     Describes symbol assigments statements.

  CALL              Transfers control to a labeled subroutine in a
                    command prodecure and creates a new procedure level.
  DECK              Marks the beginning of a special input stream.
  DELETE/SYMBOL     Deletes one or more names from a symbol table.
  ENDSUBROUTINE     Ends a CALL subroutine and returns control to the
                    command following the CALL command.
  EOD               Marks the end of a special input stream.
  EXIT              Terminates a command procedure.
  GOSUB             Transfers control to a labeled subroutine in a
                    command procedure.
  GOTO              Transfers control to a label in a command procedure.
  IF                Executes a command only if an expression is true.
  INQUIRE           Requests input and assigns the result to a symbol.
  ON                Specifies an action to perform when a condition occurs.
  RETURN            Terminates a GOSUB subroutine procedure and returns
                    control to the command following the calling GOSUB
                    command.
  SET CONTROL       Controls the use of the CTRL/T and CTRL/Y keys.
  SET ON            Sets error checking on or off.
  SET RESTART_VALUE Sets the value of a batch job restart symbol.
  SET VERIFY        Displays command input as it is read.
  SHOW SYMBOL       Displays the value of a symbol.
  SUBROUTINE        Begins a CALL subroutine.
  WAIT              Suspends processing for a specified period of time.

  OPEN              Makes a file available for reading or writing.
  CLOSE             Terminates processing of a file.
  READ              Reads and optionally deletes a record from an open file.
  WRITE             Writes a record to an open file.

  Type ? to display the list of HINTS.
  Type COMMAND_PROCEDURES to redisplay this particular hint.
  Press the RETURN key before typing a command or topic name.