Anyway to see what the customer sees in his customer portal before him ?

Anyway to see what the customer sees in his customer portal before him ?

I want to be able to see exactly what and how the customer is going to see in his portal before ! enabled it.

As a matter of fact i would like to see his portal at all times. Sometimes a customer calls and talks to me about what he sees in his portal and as i do not have the same view (i do have the elements : quotes, invoice, paiements), i cannot assit him correctly during the support call.