The Edit Warp Control Points dialog appears when you press Shift+D or select Raster Effects Menu > Warp > View/Edit Control Points.

It lets you:

Add a warp control point.

Delete a control point.

Delete all control points.

Omit a control point from a warp run.

Save a set of control points.

Load a set of control points.

Do a warp run and view warp errors.