Shoutbox

We have a family computer spread over 5 user accounts, there is only one admin, which is myself. Is there a program that i can use on all 5 accounts like a messaging one? Where the users can type a message that they have a problem (say for example a program isnt working or they want something installed) is there any programs that send a message to the administrator and pop it up when the admin logs in. I know about the Send Message feature in Ctrl Alt Del and i need something to display the messages even if the PC is restarted.

Thanks