HP-UX TN3270 R7 Administration Guide

Configuring TN3270
Overview of the Configuration Process
Chapter 3 27
It is possible to write a new configuration directly to the running
configuration file /etc/opt/tn3270/com.cfg by using the file
/etc/opt/tn3270/com.txt as input. However, any active copies of the
TN3270 emulation program continue to run with the previous
configuration and are not affected by the change. For example, if you
change the parameters that control whether audit or exception messages
(or both) are recorded, any active TN3270 emulation programs continue
to use the previous settings. Users must stop and restart the TN3270
emulation program for the new settings to take effect.