Pg. of GC20-1819-2 Rev March 30, 1979 by Supp. SD23-9024-1 for 5748-118 from his virtual machine, and after he has done so, you can establish
the link:
cp link * 191 191 When you link to your own disks, you can specify the userid as * and you
do not need to specify the access mode or a password.
Iou can find more information about the CP LINK command and CP access modes in iQE Identifying Your Disk to eMS: Accessing
LINK and DEFINE are CP commands: they tell CP to add DASD devices to
your virtual machine configuration. CMS must also know about these
disks, and you must use the ACCESS command to estatlish a filemode
letter for them:
access 194 b CMS uses file mode letters to manage your files during a terminal
session. By using the ACCESS command you can control: • Whether you can write on a disk or only read from it (its read/write
status) • The library search order for programs executing in your virtual
machine • Which disks are to contain the new files that you create
If you want to know which disks you currently have access to, issue
the command: query search You might see the following display: PER191 DAT194 CMS190 CMS19E 191 A
198 B 190 S 19E I R/i R/O R/O R/O The first column indicates the label on the disk (assigned when the disk
is formatted), and the second column shows the virtual address assigned
to it.
The third column contains the file.ode letter. All letters of the
alphabet are valid filemode letters.
The fourth column indicates the read/write status of the disk. The 190 and 19E disks in this example are read-only disks that contain the CMS nucleus and disk-resident commands for the CMS system. You will
probablv use your 191 (A) disk as your primary read/write work disk.
14 IBM VM/370 eMS User's Guide

Pg. of GC20-1819-2 Rev 30, 1979 by Supp. SD23-9024-1 for 5748-XX8 RELEASING VIRTUAL DISKS When you no longer need a disk during a terminal session, or if you want
to assign a currently active filemode letter to another disk, use the eMS command RELEASE:
release c
Then, you can issue the ACCESS command to assign the filemode letter C
to another disk.
Section 1. What it to Have a CMS Virtual Machine 14.1