IBM Professional Series User Manual page 177

The abbreviations "fn," "ft," and "fm" refer to
filename, filetype, and filemode, respectively. The
combination "fn ft <fm>" is also called the file
identifier or fileid.
When a command format box shows the characters, fn ft
fm or fileid and they are not enclosed by brackets or
braces, it indicates that a CMS file identifier must be
entered.
If an asterisk
(*)
appears beneath fn, ft, or fm, it
indicates that an asterisk may be coded in that position
of the fileid. The operand description describes the usage
of the
*.
• Lowercase letters, words, and symbols that appear in the
command format box represent variables for which
specific information should be substituted. For example,
"fn ft fm" indicates that file identifiers such as
"MYFILE EXEC AI" should be entered.
• Choices are represented in the command format boxes
by stacking:
A
B
C
An underscore indicates an assumed default option. If
an underscored choice is selected, it need not be
specified when the command is entered.
Example:
The representation:
A
B
C
indicates that either A, B, or C may be selected.
However, if B is selected, it need not be specified. Or, if
none is entered, B is assumed.
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VM/PC Users Guide