Changing Modifiers in the Middle of Drawing Commands

To change the active modifier in the middle of a drawing command, use the Function Keys.  This is useful if, for example, you want to begin a line by snapping it to a gridpoint, but end it by snapping it to the endpoint of another line which might not be on the grid.

The Function Keys toggle modifiers as follows:

F5 - Snap to Grid

F6 - Snap to Intersection

F7 - Snap to Object

F8 - Snap to Rotation

F9 - Orthogonal Lock