Next, on the system that you want to receive these remote messages on (not the sending system), start System Preferences and open the 'Growl' section. Growlnotify is the command-line client that can be scripted to send messages to a remote Growl server. Also, be sure to install growlnotify in the Extras/ folder of the Growl install disk image. Growl is a great notification system and a number of applications use it, so if you don't have Growl already installed, you're really missing out.
The first thing is to install Growl if it is not already installed. The solution involves some command-line use, and the Growl notification system.
Much like older versions of Windows had a quick-and-dirty instant messaging facility via WinPopup, it is possible to make OS X do something similar. One handy feature when you have multiple systems is the ability to send quick instant messages from one Mac to the next.
