O memory, wherefore art thou?

Put a call out over at Southernphried to see if anyone knows of a good piece of shareware/freeware that does static posts over a LAN. A client needs to make a list available to all the computers of current dispatches concerning their vehicles. It is updated every few minutes. Setup a dispatch sheet here on the server, but only one person can open it at a time. I've seen this done on several occasions and am drawing a blank. Please help my feeble mind.

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
-Albert Einstein