MPE/iX - CI Programming for Stability

July 18, 2008 HP World '01 10
Recommendation
• UDCs provide a repository and are easier to locate, but they
are more difficult to change after they have been cataloged.
They are also more difficult to purge (deliberately or
accidentally).
• Scripts can be located anywhere but are easier to maintain if
they are kept in one or a few groups / directories. Scripts are
easier to modify and delete.
• My experience has been to use scripts as my first choice and
only use UDCs to override built-in MPE commands.
• Use ESCAPE rather than RETURN for script errors that
demand user attention/intervention