The Unix help command.  man displays the manual pages for a command.

man command-name   displays the on-line manual pages for
		    command-name
man -k  string     lists one-line summaries of all of the 
 		     manual pages containing string

Sun Microsystems:
THE jumping off point for Sun help is http://www.sunhelp.com/

All of the Sun documentation is availave on the web at: http://docs.sun.com/
This site contains all of the system, software, and tools documentation
(even the programming tools docs).


LINUX documentation:
LINUX documentation can be found at http://sunsite.unc.edu/LDP/


GNU documentation:
GNU documentation can be found at http://sunsite.utk.edu/gnu/