The 'Relative' keyboard snap feature allows a quick and easy way to specify co-ordinate positions relative to existing geometry. The 'End' keyboard snap allows a quick and easy way select the 'End' point of an existing entity.
To use this feature simply position the cursor over an entity e.g. a line, and hit the key. Draft it now displays the snap symbol at the nearest endpoint. If a dynamic line was previously attached to the cursor this also attaches to this endpoint. If you are happy with the point selected click anywhere in the drawing area to accept.
Use of these keyboard snaps also automatically switches to the Snap input mode.