Obtain help on the XSPEC commands, their syntax, and examples of their use.
XSPEC> help [<topic list>]
The help command uses the XHELP interactive help facility. The optional topic list can be used to go directly to a particular topic and sub-topic. The X HELP facility has a number of special input characters used to access different sub-topics. The string ?? will produce a summary of these sub-topics. To exit back to XSPEC, use an <EOF> or type <CR> until you leave the help facility.