[flexcoders] Is it ok to load in a sub-application using a swfloader?

[dorkie dork from dorktown]

In my intial application swf I've kept it small to load quickly. If
the user decides to use the application I want to load that into the
initial app swf. How do I do this? Should I create a new instance of
system manager and set it to load the new swf (not sure how)? Should I
use a loader to load the main application? Will that keep the initial
swf in memory thus using up that memory?

JP