GL_GENERALLEDGER - Required
	Displays the chart of accounts, and account register. 


GL_ADMIN	 - Required
	Displays the admin screen.

GL_HTML		 - Required
	Provides functions for displaying the HTML templates. Has debug functions.
	Creates the GnuLedger web-interface.

GL_MODE		 - Required
	Controls different display modes and authentication.


GL_MODULES	 - Required
	Controls the use of GL modules.


GL_HELP		 - Required
	GnuLedger help system.


GL_FUNC		 - Required
	Provides various functions for manipulating the MySQL database, etc.


GL_XML		 - Optional
	XML subsystem. Displays all GnuLedger data in XML format. 


GL_WAP           - Optional
       WAP subsystem. Allows GnuLedger to work with WAP wireless phones.


GL_INVENTORY     - Optional
       Inventory subsystem.
