VM/370 Spool System Interface RSCS uses the V8/370 spool system to interface with VM/370 users. When a user generates a file to be transmitted to a remote location
by RSCS, he must comply with two requirements. The file must be spooled
to the RSCS virtual machine and the spool file tag associated with the
file must contain, as the first entry, the linkid (location identifier)
of the remote station to which the file is being transmitted. When a remote station transmits a card file to RSCS, the file must be
preceded by an ID card containing the userid of the virtual machine that
is to receive the file. RSCS punches the file on a virtual punch and
spools it to the appropriate virtual machine. If the userid is that of
the RSCS virtual machine and the ID card also contained valid tag data, RSCS will retrieve the file from the 18/370 spool system and forward it
to the remote station designated by the linkid in the tag data. RSCS Command Language
The RSCS command language provides the RSCS virtual machine operator
with the following capabilities: • Manipulate the status, transmission priority, class, and order of
files owned by the RSCS virtual machine. • Initialize, suspend, or terminate transmission of files to remote
terminals or stations. • Reposition or restart files currently being transmitted. • Send or forward messages and commands to remote terminals and
staticns. • Query file, link, or system information. • Monitor link activity for any remote location.
A summary of the RSCS commands is shown in Figure 43; for a full
description and the format of each, refer to "Appendix A: Remote Spooling" Communications Subsystem Commands" in the 1]L170 330 IBM VM/370 System Programmer's Guide

r----- I Command
Name BACKSPAC CHANGE
CMD
DEFINE
DELETE DIS CONN DRAIN FLUSH FREE FWDSPACE HOLD MSG ORDER PURGE QUERY START TRACE
Function
Restart or reposition, in a backward direction, the file
currently being transmitted.
Alter one or more attributes of a file owned by Control certain functions performed by a remote system,
or control the logging of I/O activity on a specified
link.
Temporarily add a new link definition to the RSCS link
table or temporarily redefine an eXisting link.
Temporarily delete a link definition from the RSCS link
table. Place RSCS in disconnect mode and, optionally, direct
output to another virtual machine.
Deactivate an active communication link.
Discontinue processing the current file on the specified
link.
Resume transmission on a communication link previously
in HOLD status.
Reposition, in a forward direction, the file currently
being transmitted. Suspend file transmission on an active link without
deactivating the line. Send a message to a local or remote station.
Reorder files enqueued on a specific link.
Remove all or specified files from a link.
Request system information for a link, a file, or the
system in general.
Activate a specified communication link.
Monitor line activity on a specified link.
Figure 43. RSCS Command Summary A subset of the RSCS commands is available to the remote station
operators. In general, the remote operator can issue only those commands
that affect file processing at his specific link. The commands are
punched, one per card, and entered at the remote card reader. Commands
from remote stations are only accepted before the ID card of an input
card file or after the file has been completely processed (end of file
generated). Part 4. Remote Spooling communications Subsystem (RSCS) 331