Hand stamps?

[tinkwest]

Once your ticket is activated you will need both your ticket and a hand stamp for the rest of the day. If you have been to one park and are hopping to the other, get a hand stamp. If you have been to one park and are leaving for a time and then returning, get a hand stamp. Annual passholders should not need a stamp unless it is a SUPER busy day with the possibility of park closures. The CMs usually make it clear if everyone, including passholders, needs one.

[NewDVCowner]

If you're going from one park to another directly you will not need to go through security again, as the security check is outside of the courtyard area. If you leave the parks, going to Downtown Disney, your hotel, etc, you will need to go through security again to get back into the parks.