Show who's logged in on local machines
The rwho utility produces output similar to who, but for all machines on the local network. If no report has been received from a machine for five minutes, rwho assumes the machine is down, and doesn't report users last known to be logged into that machine.
If a user hasn't typed to the system for a minute or more, rwho reports this idle time. A user who hasn't typed to the system for an hour or more is omitted from the output of rwho unless you specify the -a option.
The rwho utility requires the libsocket.so shared library.
This utility is unwieldy when the number of machines on the local net is large. It's unreliable due to protocol issues.