Suggestions for Remote Procedure Calls from PG, please?

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What's the best way to invoke a process on another server from a PG
trigger or procedure?  I was thinking of using pl/java to invoke a web
service on the other box...  Can pl/tcl run Expect scripts?  That'd be
an option, too.  Or I could use XMLBlaster to send a message to the
other box to start the other process, but that's an asynchronous call
and I can't be sure if the remote procedure ran properly.

Does anyone else invoke a process on a remote server?  How do you do it?

Thanks,

Bret
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