WHO Displays user name, port ID, and overlay loaded for each logged-in
terminal, as well as the user’s MON and SPRT commands (see below).
SEND xx Sends a message to logged-in terminal xx. When the system responds
with a “ SEND MSG: ” prompt, enter the message text yy...yy (up to 80
characters). The text of a message is considered private and therefore is
not written to any log file.
SEND ALL Sends a message to all logged-in terminals. When the system responds
with a “ SEND MSG: ” prompt, enter the message text yy...yy (up to 80
characters). The text of a message is considered private and therefore is
not written to any log file.