Fixed session transfer after API changes

Ignore-this: 63ae0c59278d6655038b23b21136e562

darcs-hash:20130115162322-56b4d-53bf18c838274c03d8cc88ecf8dfaff3e48feec1
Added ScreenSharingClient capability

Ignore-this: 7927af5bdfc38d82dc362b75e62b88b8

darcs-hash:20130118115858-58252-7f2793967873b7ed32683b16b5c56f1b4f895191