$frame-id - Current frame identity
$frame-id retrieves the identity of the current frame, this is a integer value (1..n) that is automatically allocated when the frame was created using create-frame(2).
The $frame-id is guaranteed to be unique and is typically used in macros to locate a previously created frame.
Copyright (c) 1998-2006 JASSPA
Last Modified: 2004/01/17
Generated On: 2006/10/07