I see that VCAC comes with its own IA identity appliance , can you use SSO ( single Sign on ) to log into VcAC?
Yes, if you use the correct version of vCenter Server, see below.
vCAC 6.0 SSO code has a dependancy that is not compatible with vCenter SSO ( 5.5.0a).
Latest version of vCenter Server 5.5.0b and SSO is now compatible.
New vCenter 5.50b is supposed to be compatible with vCAC 6.
5.5.0b was released on 22 December 2013