newbie question - remove a module from ram

[john fabiani]

Hi,

I believe I have good understanding of import but it occurred to me that 
I might want to remove an imported module.  I.e I load a module into ram 
and I no longer need the module.  Modules just stays in ram?  In the 
windows world I would "thisform.release()"  and the garbage collector 
would release the ram.  So did I miss something or is there no release 
method.  How about a method within a class like destroy()?

I just got to believe it's there????  But where?
John