calc includes a robust set of help files in /usr/share/calc/help
These can be accessed via the command line via "calc help" or by entering "help" from the calc interactive prompt.
Important examples include:
calc help - a list of topics
calc help bugs - known bugs and mis-features
calc help changes - recent changes to calc
calc help copyright - calc copyright and the GNU LGPL
calc help copying - details on the Calc GNU Lesser General Public License
calc help copying-lgpl - calc GNU Lesser General Public License text
