clocking is showing the search engine one thing and your visitors another (through a re-direct, etc).
domain masking is when you hide the true domain name (URL) from the visitor.
I think you mean "cloaking" as in "to cloak" ?
it's a technique first pioneered in Star Trek by the Romulans
http://en.wikipedia.org/wiki/Cloaking_d … al_origins
but now put to dastardly use by the modern day Romulans, or "Black Hat" SEOs.
it was a form of this that got BMW banned from Google
http://www.mattcutts.com/blog/ramping-u … l-webspam/
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