Retro1.org codex

Usage notes:

1.  A DIAL command is accepted only at logon, and only as a substitute for a
    LOGON command.  The type of terminal used must be supported by both VM/370
    and the multiple-access virtual machine.  See the VM/370 Terminal User's
    Guide for details on running and gaining access to multiple-access
    machines.

2.  When you do not specify a vaddr, you will get the first address available.
    If you specify a vaddr, you can dial that address as long as the device
    defined as that address is a terminal.

3.  If the DIAL command is issued from a local 3270 terminal, the virtual
    system user must issue the CP command RESET to drop the dialed connection.

4.  The DIAL command is not supported for remote 3270 terminals.

5.  Once the connection is made, your terminal operates entirely under the
    control of that virtual machine.  The DIAL command matches your terminal to
    an equivalent type defined in the multiple-access virtual machine.  If no
    matching terminal type exists, the connection cannot be made and an error
    message is issued.

Responses:

DIALED TO userid vaddr
   is the message sent to the user indicating that a logical connection has
   been made.

GRAF raddr ¦ LINE raddr ¦ DEV resid  DIALED TO userid DIALED = nnn
   is the response to the primary system operator. It indicates a successful
   connection to the virtual machine (userid) and the total number of VM/370
   lines (nnn) currently connected to other virtual machines.  DEV resid
   indicates the resource identification of a 3704/3705 line.

   Note:  The terminal remains connected to and under the control of the
   virtual machine until that virtual machine terminates the communication.

DROP FROM userid vaddr
   is the message sent to the user when the line is disabled.

GRAF raddr ¦ LINE raddr ¦ DEV resid DROP FROM userid DIALED = nnn
   is the message sent to the primary system operator when the line is
   disabled.