Prompt for Multiple Scene Locations (How?)

I need to be able to have my Python script prompt the user for multiple 3D locations in the scene. I’d like to have the user prompted to place the 3D cursor at each location and click “OK” or hit RETURN in the console window.

I’m trying not to get involved in building a script UI in Blender at the moment, as I’m trying to get all my math functions worked out first before I let myself get side-tracked learning that.

Any ideas?