How to retrieve all the art objects which are inside a selected path?

Hi,
I need it for a plug-in I want to create.
In fact, I want to enable the user to draw a closed path which will select all the objects inside it.
I actually need something like a Lasso Tool but one which also draws a path.
I'm looking for it, but unable to find it.
If you can help me, I'll be thankful.
Leon.

Let's say I require that the entire art must be inside the path(Or at least all it's anchor points).
Anyway, one thing for sure - I assume the path is a simple closed path, ie the path doesn't intersect itself(like figure 8 shape).
What is the way to check whether an art or at least a point is inside such a path(not inside it's bounding rectangle, but inside it)?
I wonder why there is no such function if the Lasso Tool exists in AI and it does some such geometry computation, at least this is what I think.
I thank you guys for your replies.

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