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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raj_nbrAsked:
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ahoffmannCommented:
xmessage UPS down

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shivsaCommented:
scnCommented:
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?
ahoffmannCommented:
Solaris does not come with xmessage, usually.
You can get it from http://www.sunfreeware.com/
raj_nbrAuthor Commented:
One more question if you don't mind. Does X message work with all versions of Linux?
ahoffmannCommented:
AFAIK yes

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