Help with Mulitple MAC

Hello,

I want solution for following situation

1 User is having Laptop and Desktop

I want to assign single user ID and password for that user

but at the same point of time user should have MAC binding.

in short I want single User ID to be binded with 2 Differnet MAC and only one session at a single point of time. How can I do this with USERMAN

I am using v5.0rc4