Autodesk AUTOCAD 2006, Command Reference Manual, Page: 422 / 1490

NOTE When you use the From option in conjunction with the Tangent snap
mode to draw objects other than lines from arcs or circles, the first point drawn
is tangent to the arc or circle in relation to the last point selected in the drawing
area.
Nearest
Snaps to the nearest point on an arc, circle, ellipse, elliptical arc, line,
multiline, point, polyline, ray, spline, or xline.
Apparent Intersection
Snaps to the visual intersection of two objects that are not in the same plane
but may appear to intersect in the current view. Extended Apparent
Intersection is not available as a running object snap. Apparent and Extended
Apparent Intersection do not work with edges or corners of 3D solids.
NOTE You might get varying results if you have both the Intersection and
Apparent Intersection running object snaps turned on at the same time.
Parallel
Draws a vector parallel to another object whenever you are prompted for
the second point of a vector. After specifying the first point of a vector, if
you move the cursor over a straight line segment of another object, the
point is acquired. When the path of the object you create is parallel to the
line segment, an alignment path is displayed, which you can use to create
the parallel object.
Select All
Turns on all object snap modes.
Clear All
Turns off all object snap modes.
Dynamic Input Tab (Drafting Settings Dialog Box)
Controls pointer input, dimension input, dynamic prompting, and the
appearance of drafting tooltips.
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