Autodesk AUTOCAD 2006 Command Reference Manual page 433

plan view
The illustration shows the camera rotating to the left from its initial position,
leaving its angle from the XY plane unchanged.
Toggle (Angle From)
Switches between two angle input modes. Entering an angle on the
command line locks the cursor movement so you see only the positions
available for that angle. Toggle unlocks the cursor movement for the angle,
and you can use the cursor to rotate the camera.
Target
Specifies a new position for the target by rotating it around the camera. The
effect is like turning your head to see different parts of the drawing from one
vantage point. Two angles determine the amount of rotation.
Specify camera location, or enter angle in XY plane <from X axis>,
or [Toggle (angle current)] <current>: Specify an XYZ point, enter t , enter an angle,
or press ENTER
Enter Angle from the XY Plane
Sets the target's position at an angle above or below the XY plane. An angle
of 90 degrees looks down from above, and an angle of –90 looks up from
camera at A
camera rotated to B
Aerial View Window | 409