Some questions on a short sale property ?

I have seen a short sale property and I have some quick questions:

1) Does the sellers lender(banker) has to approve first to list the property for short sale ?

2) Who picks the sellers realtor ? is the sellers lender ? or the seller himself ?

3) will the sellers realtor every contact the sellers lender for any info ?

4) Who decides as what price can they accept for the short sale property ? Is it the seller himself or the sellers lender ?

5) Does sellers banker ever give a $$ amount which the seller can accept for the short sale property ?

6) If the seller accepts a offer and then forwards the offer to his lender ? Does the bank usually say’s OK to that offer ?

7) Does the lender ever give a price to the seller before listing the property , so this way the seller know as what offers they can accept ? This way it helps the seller to cut down time, rather than seller accepting the offer and the afterwards he forwards to his bank and then bank rejects it.