Manual pages are references files which come with the operating system.
These reference files are usually written with the intention to provide complete description of program. In general, they are not designed to teach you how to use an application, but to provide a listing of all possible commands and options available. This WWW form is a means for you to access selected sets of manual pages which exist on Scientific Computing and Visualization systems. Once you have submitted your query, be patient in waiting for a response. This man search is often quite slow.