This article is from the alt-sources-mac FAQ, by Mark Pilgrim (f8dy@netaxs.com) with numerous contributions by others.
Alt.sources.mac IS NOT for requests for source code; the alt.sources.wanted
newsgroup is for that. Alt.sources.mac IS NOT for comments and discussion
about source code, even source code posted in alt.sources.mac; the
alt.sources.d newsgroup is for that. Only source code should be posted to
alt.sources.mac.
Alt.sources.mac isn't as widely propagated as the source newsgroups in the
"comp" hierarchy, since more sites tend to get "comp" than "alt". Therefore,
if you want your source code to have as wide a distribution as possible, you
might want to use the comp.sources.mac newsgroup instead of, or in addition
to, alt.sources.mac.
 
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