agent
Indicates whether the Help documentation should
be presented with GAMGI or an external browser.
Example: <help agent="gamgi"/> (default)
Allowed values: gamgi, browser (optional)
browser
Shows the path to the prefered browser executable.
It is needed only when 
agent is set to 
browser.
This is equivalent to create the 
BROWSER environment variable, 
containing the same path.
 
Example: <help browser="/usr/bin/firefox"/> (default)
(after defining BROWSER in ~/.bashrc: BROWSER=/usr/bin/firefox; export BROWSER)
Allowed values: 100 ASCII characters maximum (defined in GAMGI_IO_PATHNAME) (optional)