intrinsics to displa y, change, or delete it. You can force reclassi￿cation of a JCW b y assigning it a large numeric value. For example,

SETJCW X 99

de￿nes a variable named X as a JCW with value 99. The statemen t:

SETVAR X 400

gives X the new value of 400, but X remains a JCW. However, when you assign a string v alue ABC to X with the statement:

SETVAR X "ABC"

then X becomes a variable and not a JCW. MPE/iX informs y ou of the change with the message:

JCW HAS BEEN RE-CLASSIFIED AS A STANDARD VARIABLE

JCW and CIERROR

Two special session-lev el JCWs named JCW and CIERROR are also system JCWs. Therefore, they cannot be reclassi￿ed as session-lev el variables or deleted. You can change their values with the SETVAR and HPCIPUTVAR commands, but only to assign a new v alue in the legal range for JCWs. If y ou attempt to assign a v alue outside the range, MPE/iX issues the message:

THE VALUE MUST BE AN INTEGER IN THE RANGE 0...65535

and the initial value remains unchanged.

Reserved-word Prefixes

JCWs with reserv ed-word pre￿xes and numeric values are:

SYSTEM 49152

FATAL 32768

WARNING 16384

OK 0

Help Facility

The MPE/iX Help facilit y is available for commands, User-De￿ned Commands (UDCs), command ￿les, and program ￿les. Command ￿les and UDCs ha ve two special options for the Help facilit y: HELP and NOHELP . NOHELP disables the Help facilit y to provide increased security for UDCs and command ￿les. When NOHELP is active, you can execute a UDC or Command File, but cannot displa y its contents. HELP is the default option. F or detailed information on this topic, refer to Command Interpreter Access and Variables Programmer's Guide (32650-90011).

Utilities and Tools 2-3