Setting up multiple SPs with one single IDP

Hi all,
I was wondering if someone could explain how to test multiple SPs (2 for
example) with one single IDP using SourceID.NET.  I have setup two separate
SPs and one IDP. I created an account on SP1 and federated it with the IDP.
Then I created another account on SP2 and federated it with the IDP. What I
would like to test is
a) how do I access the two SPs by just logging onto one of them?
b) if I am using the SqlFederationHandler, do I have to use the same
database and table (account_federations) for both two SPs and IDP?

Any help you could provide will be appreciated.
Thanks,
Mamoud.