I want to send a message to all currently logged in users (or all users regardless of their login status)
on machine 192.168.1.30

Therefore the well known "net send" command seems not to work.

At least

net send 192.168.1.30 "Hello"

does not work.

Is there a (simple) work-around or replacement ?

Theo

As far as I know you cannot use "net send" with an IP but with user names:

http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/net_send.mspx?mfr=true

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Try this

http://support.microsoft.com/kb/839018/

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RichardM points you at the article to explain why this does not work, and the
article explains how to turn the Windows Messenger service back on.

But you may want to know that SP2 turned Windows Messenger off because
malware sites were using Windows Messenger to deliver payloads onto
unsuspecting systems.  The user would browse a site then suddenly get a popup
message saying something or other, and by trying to act on the window (by
answering yes\no, whatever), the maulware could activate. 

So if you really need to do the messaging, turn the service on, but it may
not be smart unless you've got good firewall and website blocking systems in
place (i.e. websense). 

Silly marketing department, macs are for kids. 

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