In a quite old document about PAS (sorry, can't find the link now, it's on my hard drive), there's a slide about resource sharing in _mproapsv. What's not shared is :
Is this list still relevant in 11.6 ?
Right, stuff shared between sessions. Why a difference between shared memory and network DB connections ? What does that mean in practice ?
That is a little misleading. There are some resources that are shared (file access, for instance), but without getting too deep into details, for all intents and purposed, they are not shared from the ABL perspective. Each session has its own connection to the db, period.