Rails - Mar 2006 - How to integrate layouts?

I am a newbie of rails and now am confused about the layouts'' 
integration.
Suppose that in the current projects,I have imported the plugin of 
"Login Engine",
and then created the scaffold files.
now I want the default layout-- suppose to be "application.rhtml" to 
include both the module that the two module can be displayed on single 
page,how can I do with that?tks all!

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