Connecting to session-managed business applications can be expensive depending on session startup and initialization tasks defined in your PAS for OpenEdge Connect procedure. Connecting to a session-free business application can be expensive depending on the client load for the available server resources on the network. For these reasons, you might want to connect to servers at client application startup. Also, in most designs, it is advisable that you do not disconnect from servers if you intend to use services offered by a particular PAS for OpenEdge instance more than once prior to ending the client application session.