         Plugins & overlays

 Plugins are modules editor extensions,
with the special extension '.add' created
apart from the editor and use standard
BGE function calls and GUI.
 Overlays are modules that have the
extension '.ovb', that are compiled with
the editor and using direct subroutine
BGE calls. The overlays are mainly
placed, that does not fit in the base
code BGE.

 In the main menu icon plugin divided
into 2 parts:
 Top    - menu modules.
 Bottom - list of selected modules

 The list plugin has the extension '.lst'

 Menu Plug-in:

Load      - loading module from disk
Current   - the start of the last module,
            if it's still there in memory
Run from_ - list of selected modules
List_     - set list of modules

 Some modules and internal options BGE
using page the data BGE [#14] to store
its datas.
 For example, in the loaded fonts,
chunks, files (menu Files) and help.
Why not forget to save these data (if
edited) before using these options or
other modules.