Surface selection in Edit Mode is very similar to NURBS curve selection. The basic tools are the same as with meshes, so you can select a simple control point with an LMB-click, add to current selection with Shift-LMB clicks, B order-select, and so on.
Clicking on a control point selects it, using modifier keys you can perform other operations.
- Extend/Toggle Shift
- To add to the selection or de-select when the item is already active.