Visitor Visa re-entry to differnt port of entry

[umay]

We are planning to bring my mother and father to SFO. They arelary got the 10 year visitor visa sponsered by my sister and they visited my sister (Florida)through port of entry at Atlanta 2 years back. Now we are planning to bring them to SFO, do we need to send any documents for them to show at port of entry. Does any one has any experience? I appreciate if you send us any useful information on this regard.

Thanks
Uma

[knowledgeable]

Not a problem. It's okay.

Take care.