Autodesk AUTOCAD 2006, Command Reference Manual, Page: 1249 / 1490

Accept
If you press ENTER , accepts the location. The prompt repeats until you
accept a location.
View
Establishes a new coordinate system with the XY plane perpendicular to your
viewing direction (parallel to your screen). The UCS origin remains unchanged.
X, Y, Z
Rotates the current UCS about a specified axis.
Specify rotation angle about n axis <0>: Specify an angle
In the prompt, n is X, Y, or Z. Enter a positive or negative angle to rotate the
UCS. The right-hand rule determines the positive direction of rotation around
the axis. (For information about the right-hand rule, see “Use World and User
Coordinate Systems in 3D” in the User’s Guide.)
after before
You can define any UCS by specifying an origin and one or more rotations
around the X, Y, or Z axis.
rotation about Z
axis = 90 rotation about Y
axis = 90 rotation about X
axis = 90 world coordinate
system
Move
Redefines a UCS by shifting the origin or changing the Z-depth of the current
UCS, leaving the orientation of its XY plane unchanged. Changing the Z-depth
moves the UCS along its Z axis in a positive or negative direction relative to
the current origin.
Specify new origin point or [Zdepth] <0,0,0>: Specify a point or enter z
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