list all valid option names
show_global_option x --> displays value of option
change_global_option x y --> changes value of option x to y
eg.
show_global_option FixedPitchFont
change_global_option FixedPitchFont Dina
After changing an option you should exit the client and re-open it, otherwise
if you use the GUI interface (global preferences) it may put the option back again.
]]>