Guardian Procedure Calls Reference Manual

Returned Value
INT
A file-system error code that indicates the outcome of the call:
Successful, no error.0
Bad itemcode.2
Bad value.21
Bounds error.22
Missing parameter.29
See the Guardian Procedure Errors and Messages Manual for more information.
Considerations
MESSAGESYSTEMINFO is inherently tied to the internal workings of the message system, so one
or more of its functions might not be supported by future versions of the message system. If it returns
a nonzero error, the caller should record the error, but should otherwise ignore the error.
MESSAGESYSTEMINFO Procedure 831