How to use plugins..

[Goekhan Bakir]

Hi!
This might be a newbie message but is there some example code to 
write a generic plugin manager? 

Particular problems:

1.)
Assume my package is installed on path x and has a subdirectory named
plugins.
If I import my package I want to scan automatically the plugin
directory.

2.) 
Plugins should follow a common interface,  is there a way to enforce
this?
(Actually I think this might be easy.)



Thanks for any help

gb