Jump Indirect Command
With the normal jump command, you must specify an element (menu, track, story,
slideshow, or script) to jump to, even when using the GPRM Based Button setting.
The jump indirect command provides a way to jump to an element that is entirely
determined by a value stored in a GPRM. For example, you could have a script that uses
the set command write the current menu’s value to a GPRM, and then later on have a
second script use the jump indirect command to jump to that same menu by reading
Note: You can only select from the 16-bit GPRM registers.