Alerting the user with a text message about a critical condition in C

I want to notify the user when the UPS battery goes down. A simple text message is sufficient. Any user, working on any application on KDE/GNOME/Terminal... in that machine must be alerted. I have written the C program to monitor the UPS battery, but am not able to alert the user with some on-screen text. What is the easiest way to do this?
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xmessage UPS down

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system("wall <message>")
man wall for details
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raj_nbrAuthor Commented:
Thanks for the replies. Let me try and come back to you.

Raj Nambiar
raj_nbrAuthor Commented:
Ixmessage works fine. Thanks.
Wall does not work in GNOME GUI.
Does this also work in SUN SOLARIS?
Solaris does not come with xmessage, usually.
You can get it from
raj_nbrAuthor Commented:
One more question if you don't mind. Does X message work with all versions of Linux?

if not, just get the sources and compile yourself, it's a very tiny application
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