About Button:

This button pops up a dialog that displays version and license information about GhostTrails. If GhostTrails is unregistered, this dialog will also display the Register... button and allows you to enter your registration code.

Moving Trail / Anchored Trail:

A trail can be one of two types. A Moving Trail is drawn from the object's current position back along its path of motion to its position a certain number of frames in the past. The length of the trail is controlled by the Frames To Lag spinner, which controls how many frames into the past the trail is drawn.

For example, a moving trail of an object on frame 10 and with a Frames To Lag setting of 4 would extend from the object's position on frame ten, back to its position on frame 6 (passing through its positions on frames 9, 8 and 7 along the way).

The other type of trail is the Anchored Trail. By default an anchored trail is drawn from the object's position at the start of the current active time range (usually frame 0) to the object's position on the current frame.

It is possible to change the time range over which the anchored trail is drawn by checking the Specify Range box and filling in the desired time range using the Start Frame and End Frame spinners.

Note: The Anchored Trails feature is disabled in the unregistered version of GhostTrails.