Does anyone know of a piece of freeware that i could use to broadcast a message to all network users.
Does anyone know of a piece of freeware that i could use to broadcast a message to all network users.

Provided your clients have the Messenger service running and not firewalled, you can use windows' built-in net send command:
Would send the message to all users loggged in to the domain 'mydomain'.Code:net send /domain:mydomain Logoff now or forever lose your work.
Can the recipients then reply?

No, unless they use net send - which you most certainly don't want in a school
Is this for staff or pupil use?
for staff, whern they recieve a message messenger will pop up wont they have the facility to reply to the message? What program do we use to recieve the messages?

The messenger service just provides the user a pop up containing your message and the option to close it by clicking ok.
Don't confuse the inbuilt messenger service with msn messenger.
It's completely different.
Ben
All sorted thanks for all your help.
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