This is a very commonly asked question on the steam forums. short answer, its not possible.
Id link you to the steam faq, but the link are unholy long for some reason, check out this question on there:
Can I transfer my CD Key to another Steam Account?
This issue has raged on the steam forums for a while not, creating many long and extremely boring threads.
-ctm
----- Original Message ----- From: "Matt" <[EMAIL PROTECTED]> ive got an original bought copy of hl1 and got the full package of hl2, but i cant find a way to unregister the original to re-register (to affectivly have two hl1 accounts) : ¬ /
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