This one is hard to explain without having a visual... for example, if you are looking at a box from the top view and the top two corners are not 90 degree angles, is there a way to grab the top right vertex and snap it to the height of the top left vertex to make the object perfectly square?
In Max you can select a vertex and move it along x, y, or z axis and snap it to any other vertex in the scene while keeping it on that axis.
Hope I didn't make this question overly complicated
