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=item C<nnn>

is a unique identifier

=back

For example the full name of the English version of the menu xXGEN is
C<AEXGEN.FMT>.

The page number is transparent to the CDS/ISIS user. Like the file
extension the page number is automatically provided by the system.
Therefore when a CDS/ISIS program prompts you to enter a menu or
worksheet name you must not include the page number. Furthermore as
file names are restricted to 6 characters, menus and worksheets names
may not be longer than 5 characters.

System menus and worksheets may only have one page.

The language code is mandatory for system menus and standard system
worksheets. For example if you want to link a HELP menu to the system