Updating packages

Vladimir <[email protected]>
Newsgroups gmane.comp.tex.tetex.general
Message-ID <[email protected]> 
Hello all.
Is there a way to update or install packages for tetex like this
<tetex-tool> [ --update-package | --install-package ] <package> ?
Or it is preferred to download packages from CTAN and to update or 
install them with the help of dtx files.
Thanks in advance

PS: Sorry for my poor English

Best regards, Vladimir        lomov at physdep dot isu dot ru
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