Yes! Tickets are counted per open day at the park (not per 24hrs) and you can leave and re-enter as often as you wish within the day. If you have a park hopper ticket you can move back and forth between the two parks (Disneyland and DCA) as often as you like, but if you have single park entry then the first park you enter on the day will be the only one you can re-enter that day.
Yep!
Yes with your ticket and a hand stamp you can come and go as you please. If you have a park hopper this allows you to move back and forth between the two parks
Yes
Yes you can. When you go in they take your picture with the ticket and when you re enter they scan and match you with your ticket.
They don't do hand stamps now they take your picture and your picture shows when you scan your tickets
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