The portal opens a new session in every call to the sap R3

Hello everybody,

In some of the iViews of our portal we are calling

SAP transactions (iViews of type SAP transaction).

Every time one of this iViews is being called it opens a new session in the R3 (we know that since our system is slow and we can see the logon screen each time).

Can anyone tell me if this is the normal stat for using this transaction iViews.

or is there a way to make the portal use the same SAP R3 session as long as we are in the same session in the portal?

Thanks for any information,

Adi