There used to be the ability, perhaps before OS X, to send messages accross the local network, which displayed a popup on the receivers machine with the message. Is this still possible? Or is there another way to send a message to another member of the network?
If this isn't possible, could a text file be sent, with a message, to a recipients Public folder?
Preferably with the terminal.
(I realise there are lots of aps which do messaging, but I was curious if this was possible without installing software or setting up iChat etc)