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=item C<.eee>

is the file extension identifying a particular type of file.

=back

Files marked with C<*> are ASCII files which you may display or print. The
other files are binary files.

=head2 A. System files

System files are common to all CDS/ISIS users and include the various
executable programs as well as system menus, worksheets and message
files provided by Unesco as well as additional ones which you may
create.

=head3 CDS/ISIS Program

The name of the program file, as supplied by Unesco is

  ISIS.EXE

Depending on the release and/or target computer, there may also be one
or more overlay files. These, if present, have the extension C<OVL>.
Check the contents of your system diskettes or tape to see whether
overlay files are present.

=head3 System menus and worksheets

All system menus and worksheets have the file extension FMT and the
names are built as follows:

  pctnnn.FMT

where:

=over 10

=item C<p>

is the page number (A for the first page, B for the second, etc.)

=item C<c>

is the language code (e.g. E for English), which must be one of those
provided for in the language selection menu xXLNG.

=item C<t>

is X for menus and Y for system worksheets

=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
menu EXGEN, its name must begin with the letter E.

The B<X> convention is only enforced for standard system menus. It is a
good practice, however, to use the same convention for menus that you
create, and to avoid creating worksheets (including data entry
worksheets) with X in this position, that is with names like xB<X>xxx.

Furthermore, if a data base name contains B<X> or B<Y> in the second
position, then the corresponding data entry worksheets will be created
in the system worksheet directory (parameter 2 of C<SYSPAR.PAR>) rather
then the data base directory. Although this will not prevent normal
operation of the data base, it is not recommended.

=head3 System messages files

System messages and prompts are stored in standard CDS/ISIS data bases.
All corresponding data base files (see below) are required when
updating a message file, but only the Master file is used to display
messages.

There must be a message data base for each language supported through
the language selection menu xXLNG.

The data base name assigned to message data bases is xMSG (where x is
the language code).

=head3 System tables

System tables are used by CDS/ISIS to define character sets. Two are
required at present:

=over

=item C<ISISUC.TAB>*

defines lower to upper-case translation

=item C<ISISAC.TAB>*

defines the alphabetic characters.

=back

=head3 System print and work files

Certain CDS/ISIS print functions do not send the output directly to the
printer but store it on a disk file from which you may then print it at
a convenient time. These files have all the file extension C<LST> and
are reused each time the corresponding function is executed.