Is this where I change address for drivers licence &registration? What is the cost?

Yes, if you live around Harrisburg. As you know there are so many other PennDOT offices

Beth, You can do it on line for free and Penn DOT will mail you a yellow update card that you carry with your licence. If you want to come in and have a corrected duplicate made it will cost $29.50. cash check or money order.

Yes

lost license need duplicate

All their info is on their website https://www.dmv.pa.gov/Pages/default.aspx