SET SMSG IUCV. CP sends an error message to any virtual machine that
attempts to send a special message to another virtual machine that is not accepting
special messages.
CP handles VMCF /IUCV initialization and special message processing as follows.
When the SMSG command is issued, CP verifies that no invalid options were speci­
fied and that a valid USERID was specified. CP also verifies that the receiving vir­
tual machine is accepting special messages. CP then obtains storage for the
message, builds the appropriate parameter list, and sends the message to the receiv­
ing virtual machine.
The Special Message Facility 199
Single Console Image Facility
The Single Console Image Facility allows one user logged on to a single virtual
machine to control mUltiple disconnected virtual machines. CP prefixes any output
coming to the controlling virtual machine, from or on behalf of the originating vir­
tual machine, with the userid of the originating virtual machine. The controlling
virtual machine communicates with the virtual machines it is controlling via the CP class G SEND command.
The user whose virtual machine is being controlled is the primary user. The user
whose virtual machine controls the primary user's virtual machine is the secondary
user. The secondary user may run disconnected if he has a valid path to the IUCV Message System Service. Refer to "The Message System Service" in Part 1 of this
publication for more information. Using the Single Console Image Facility
To enable a virtual machine to use the single console image facility, the installation
must specify the userid of the secondary user on the CONSOLE directory control
statement of the primary user. See VM / SP Planning Guide and Reference for a
description of the CONSOLE directory control statement.
When the primary user disconnects his virtual machine and the secondary user is
logged on, the secondary user receives control of the primary user's virtual
machine. Even if the secondary user is not logged on when the primary user dis­
connects, the secondary user receives control of the disconnected virtual machine
whenever he does logon. The primary user can regain control of his virtual
machine at his own terminal by entering the LOGON command.
After the primary user disconnects, all console output from the disconnected virtual
machine appears on the console of the secondary user if he is logged on. Output from the primary user's disconnected virtual machine is prefixed with the userid of
the primary user.
The secondary user uses the CP SEND command to communicate with the primary
user's disconnected virtual machine. See VM / SP CP Command Reference for Gen­
eral Users for a description of the SEND command.
Notes:
1. When the message, 'DMKQC0150A USER userid HAS ISSUED A CP READ' is received by the secondary user, the secondary user must reply with a SEND command, sending a CP command to the disconnected user named in
the message.
2. When the message, 'DMKQCO 150A USER userid HAS ISSUED A VM
READ' is received by the secondary user, the secondary user must reply with a SEND command, sending a virtual machine command or a virtual machine
reply to the disconnected user named in the message.
3. The console attributes of the secondary user are used for the display of mes­
sages. For example, if the primary user console is spooled TERM and the sec­
ondary user console is spooled NOTERM, only the messages that would
normally be displayed with the NOTERM option are displayed at the second­
ary user's console. 200 VM/SP System Programmer's Guide
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