Best Network Message Sending With Smallest Footprint.

I'm looking for a very simple, easy to use method for management to send popup messages to employees on a 40 user internal network. Something that hopefully does not require a horrible install of potentially problematic junk. Something that will just send alerts to a group of users with a blatantly obvious user interface.
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Office communicator 2005
It depends on the composition of your network, if you're Windows only / Unix only / Multiple OS you have different things to be concerned with.
This page has several suggestions for Windows

I've heard good things about

You may also be interested in looking at

In a mixed OSX/Linux/Windows network you can use Net Send on the Windows side and
# smbclient -M  on the other systems.  

If you don't have net send on your windows computer you can use netsend.exe available

Of course some people consider a messaging system a security risk and prefer to use e-mail announcments and some prefer to use Instant Messengers.  Finally with the prevalence of cellphones these days, you may even consider texting your users. Here's a list of methods for sending text to phones for various carriers:  Note that the cost information on this site is years old so you may want to verify that the cost to send is now free (which it almost certainly is.)

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machine_runAuthor Commented:
It has to be fisher-price simple, no command line, nothing elaborate, hopefully no server installation. Windows Server 2005 network-compatible. It just needs to popup alerts on easily selectable users' PCs. ie: "The building is on fire! Run away!"
machine_runAuthor Commented:
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