What parameters does an object take?

I recently discovered that objects take parameters, but the little help window doesn't pop up when the open parenthesis is typed indicating what parameters it takes. My forum search fu and my manual search fu haven't found anything.

For example, what parameter goes here?: Sprite(???).X

It lets you specify a zero-based index ID. So, for example, if you have two Sprite objects, Sprite(0).X returns the X position of the first Sprite and Sprite(1).X returns the X position of the second.

See IndexIDs in the manual, then look at Object Expressions on the Expressions page.

Thanks linkman! That makes sense.