Scanning machines on a network

[Richard Gaskin]

A lot of software packages scan the local network to see if other copies of
the software may be running with the same serial number.

I've thought of many ways to accomplish this, but all of them seem slow and
inefficient.

How is this done?

-- 
 Richard Gaskin 
 Fourth World Media Corporation
 Custom Software and Web Development for All Major Platforms
 Developer of WebMerge 1.9: Publish any Database on Any Site
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