I've got a bit of an odd question...and im not sure if its possible, but here goes. Is it possible to restrict the mouses movement to an axis in space(i.e. mouse can only move along the x,y axis in space) is it possible? or is there a way to place a(xy or xz) grid(possibly a model) in space and have the mouse select points on the grid(s)?

[EDIT]: or maybe track the mouses position on a model of a grid...perhaps..