FeatureSetEM contains extension methods that should work for any IFeatureSet

	Name	Description
	Buffer	Creates a new polygon featureset that is created by buffering each of the individual shapes.
	CombinedFields	Generates an empty featureset that has the combined fields from this featureset and the specified featureset.
	Dissolve	Calculates a union of any features that have a common value in the specified field. The output will only contain the specified field. Example: Disolving a county shapefile based on state name to produce a single polygon shaped like the state.
	Intersection	This tests each feature of the input
	Intersects	Tests to see if this feature intersects with the specified envelope
	UnionShapes	This method will create a new IFeatureSet with the the shapes that intersect merged into single shapes, or else it will return a new featureset where EVERY shape is unioned into a single, multi-part shape.