2checkout for multiple websites?

I have multiple websites that I currently accept PayPal only. I no longer want to use PayPal and instead would like to use a merchant to procesd my payments.
My questions are as follows:
1) Do I need a PayPal account to use 2checkout or do they accept PayPal payments on my behalf and credit those payments to my 2checkout account?
2) As I have multiple websites can I use the same 2checkout merchant account for all websites?
Thanks for any help.

See original post by hboy