discovering printer options

[Anonymous]

It's always driven me nuts with CUPS the way it hides from the user all the possible options for a printer.  In Windows, the gui shows me all my printing options.  But when I look at the lp man pages, forget it; only a small fraction of my printers options are documented.  CUPS doesn't even give me the capability to do something as simple as instructing lp to use the manual feed tray instead of the default.