void Initialize(char *file, int server = -1)
Initializes the help instance with a help filename, and optionally a server (socket) number (one is chosen at random if this parameter is omitted). Does not invoke wxHelp. This must be called directly after the help instance object is created and before any attempts to communicate with wxHelp.
You may omit the file extension, and in fact this is recommended if you wish to support .xlp files under X and .hlp under Windows.