 module(+Module)
module(+Module)module(Module) may be used to switch 
the default working module for the interactive top level (see prolog/0). 
This may be used when debugging a module. The example below lists the 
clauses of file_of_label/2 
in the module tex.
1 ?- module(tex). true. tex: 2 ?- listing(file_of_label/2). ...