The In parameters on a Page are defined on the Start stage, the Out parameters are defined on the End stage - no surprises here.
On the actual Page call properties, where the Page is called, the parameters are split in an In and an Out tab, making it hard to get an instant overview of what goes in and what comes out.
Wouldn't it be nice if the Page call properties would show all In and Out parameters on one tab? (...obviously mentioning what way each parameter goes...)