get_default(+Displayable, +Program, +Option, -Value)
     get_default(+Program, +Option, -Value)

Provides a simple interface for clients that want to find out about application preferences without using the Resource Manager. Defaults are usually loaded into the RESOURCE_MANAGER property on the root window at login. If no such property exists, the resource file ~/.Xdefaults is loaded. Additional defaults are obtained from the filename specified by the environment variable XENVIRONMENT.

Displayable is a ProXL Displayable. If omitted, the default Display is used.

Program is an atom specifying the name of the program.

Option is an atom specifying the option name.

Value is an atom giving the preferred value for the option.