March 30, 1979
338 IBM VM/370 eMS User's Guide

March 30, 1979
Appendix C: Considerations for 3270 Display Terminal Users
The IBM 3270 display terminal w commonly referred to as a 3270, functions
somewhat differently from a typewriter-style terminal when you use it as
a virtual machine console under VM/370. Apart from the obvious
difference in the way output is displayed, there are special techniques
you can use with a 3270 that you cannot use on a 2741 or other
typewriter terminal. This appendix describes how to use a 3270 and
provides additional notes to supplement discussions in the first part of
this publication.
Entering Commands Since the keyboard on a 3270 is never locked during the execution of a
command or program, you can enter successive command lines without
waiting for the completion of the previous com.and. This stacking
function can be combined with the other methods of stacking lines, such
as using the logical line end symbol (I) to stack several command lines.
If you try to enter more lines than the terminal buffer can accoamodate, however: you receive the status aessage NOT ACCEPTED and you must wait until the buffer is cleared before you can enter the line. You will find, as you becoae accustoaed to using a 3270, that the 'CP function is very The ICP function
6 reaember
6 is a function that
allows you to pass a command line to the control program i.mediately, bypassing any processing by the virtual machine (eeS). The tcp function can be used in any VM/370 environment, and you can enter it even when a
program is executing. You do not have to interrupt a program's execution
to enter a command line such as: Icp display psw
to display the current PSW, or: Icp spool printer class s
to spool your virtual printer.
If there are CP and CMS commands that you use frequently, you can set
the program function (PF) keys on your terminal to execute thea. Soae examples of commands you might wish to catalog on PF keys are: .CP DISPLAY PSW ICP QUERY PRINTER ALL QUERY SEARCH To set functions keys 1, 2, and 3 to perform these co.mand functions,
enter:
cp set pf1 immed "Icp display psw
cp set pf2 iamed "Icp query printer all
cp set pf3 im.ed query search
Appendix C: Considerations for 3270 Display Terminal Users 339