Transparency support since 4.0.2?

"Charles Goodwin" <[email protected]>
Newsgroups gmane.comp.xfree86.forum
Message-ID <[email protected]> 
According to this link, full transparency has been in XFree since 4.0.2:
http://dot.kde.org/982423960/982429802/982440263/

Is this correct?  If this is correct, how come it is so unknown / unused? 
Are there issues with it (speed, support)?

- Charlie

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