Certain Vertices with certain colors

Support Basics & Interface
1

Is there any way to select say 4 vertices and have the area in between them a different color than the area around them? If so how?

If this is not clear, say you subdivide a plane. With the subdivision you select a square (one of the corners). You want this square to be blue, but you want the rest of plane to remain the same color.

Please help me.

2

Make your selection, go to F9 and under the links and materials tab, create a new material and apply. Then go to F5 and make the material single user and change its colors.
Hope it´s clear enough.

Rangel