>While investigating on manipulating a SOAP header, I found various Microsoft examples that I can't run. For example, the folling should create a SessionInfoClient object.
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>

>loUniversalThread.HeaderHandler=CreateObject('SessionInfoClient.ClientHeaderHandler')
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>Whenever I try that it says class definition not found.
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>Is this doc still valid?

Are you looking at this sample? (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/soap/htm/soap_sam_adv_soapheaders_99bo.asp)

If so it appears that this class is a custom DLL that you create yourself and after it registers you'll be able to use it.