IBM Professional Series User Manual page 237

gives you read-only access to all the files with a filetype
of ASSEMBLE on the disk at virtual address 195. The
command:
access 100 z/a * * zl
gives you access to all files on the system disk (loa) that
have a filemode number of 1.
When you access any disk in read-only status, files with
a filemode number of
a
are not accessed.
4. You can also identify a set of files on a disk by referring
to a filename or file type prefix. For example:
access 192 cia abc*
accesses only those files in the disk at virtual address
192 whose filenames begin with the characters ABC.
The command line:
access 192 cia * a* c2
gives you access to all files whose filetypes begin with an
A and that have a filemode number of 2.
5. You can force a read/write disk into read-only status by
accessing it as an extension of another disk or of itself;
for example:
access 101 ala
forces your A-disk into read-only status.
6. When a disk is made a read-only extension of another
disk, commands that typically require or allow you to
specify a filemode may search extensions of the specified
disk. The exception to this is the LISTFILE command.
For a detailed description of read-only extensions, see
the VM / SP eMS User's Guide.
7. If you enter the ERASE option by mistake, you can
recover from the error as long as you have not yet
written any new files onto the disk. (That is, you have
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VM/PC Users Guide