You have to remember that Personas is just allowing you to provide a new interface to an existing ERP transaction. Behind the scenes of your flavour is the unaltered ERP transaction providing all of the functionality, running pretty much as it does in SAPgui. You can't run two transactions at once, and you can't call another transaction without abandoning the one that's currently running.
That said, if you tell us what you are trying to achieve there might be a way of doing at least some of it.
Steve.
