The CHARMM forum,  http://www.charmm.org/, offers access to questions and answers to a wide variety of CHARMM related use and other issues.  Please join the forum and use it as a resource to answer your questions; please check to previously posted questions before sending yours.  It will save us a lot of time!

Additional sites to access CHARMM documentation and other information

http://www.scripps.edu/brooks/

http://master2.lobos.nih.gov/Charmm/

http://yuri.harvard.edu/

http://thallium.med.cornell.edu/RouxLab/