Resources:

CPAN: http://www.cpan.org/

libwww: http://www.linpro.no/lwp/

SSLeay: FAQ: http://psych.psy.uq.oz.au/~ftp/Crypto/
Download: FTP://ftp.psy.uq.oz.au/pub/Crypto/SSL/
Documentation: http://www.cryptsoft.com/ssleay/doc/

HTTP: http://www.w3.org/Protocols/HTTP/HTTP2.html
http://www.ics.uci.edu/pub/ietf/http/rfc1945.html
http://www.cis.ohio-state.edu/htbin/rfc/rfc2068.html

SNPP: http://www.cis.ohio-state.edu/htbin/rfc/rfc1861.html

Other paging protocols: http://www.pcia.com/wireres/protocol/links.htm

Web-based paging gateway list: http://www.refreq.com/PagingBody.htm