[Boa Constr] What is the "modules = {}" convention?

[Tony R. <to...@gm...>]

I'm just learning Boa.  The PyApp template has a declaration

> modules = {}


I have seen an example of its use

> modules = {'gettextTest':  [0, '', 'gettextTest.py']}


but have not found an explanation anywhere.   What does it mean? What does
it do? Why is it there? Is it
Boa specific?  wxPython specific?  generic Python module management
convention?

- tony
Boa newbie and new subscriber