You are allowed to output the messages from the MPE operating system
to use in your own manner, from your own applications. You should
only use the System Error Messages if you have a particular reason for
doing so. Otherwise, you should create your own message catalog.
Using the HPFOPEN, GENMESSAGE, and FCLOSE intrinsics,
you access CATALOG.PUB.SYS, the Compatibility Mode error
messages. The catalog intrinsics, CATOPEN, CATREAD, and
CATCLOSE, access SYSCAT.PUB.SYS, the Native Mode error
message catalog.
Messages are identified by message and set numbers.
Up to five paramters can be substituted in messages at run time.
Messages may be output to a file or a buffer.
