@Bill – see also into the documentation of the DOM (document object model) at:
http://www.jongware.com/idjshelp.html
It's a indispensable source of information…
Especially the chm files for searchability.
There is also a online documentation in html.
E.g. the move() method for spreads is documented here:
http://jongware.mit.edu/idcsjs5.5/pc_Spread.html#move
Uwe