Using equipped weapon/armor active abilities, and equipped weapon passive abilities

I have numerous weapons and pieces of armor with special abilities that can be activated in combat (example: using the Sunray ability with the "Daystar" sword or the Polymorph ability with the "Cloak of the Sewers"). Can't figure out how to activate these abilities during combat, though. Am sure I'm missing something obvious in the interface. Can somebody help me out on this?
Also, if Mazzy has Arbane's Sword (immune to Hold) equipped in one hand, Sword of Arvoreen (immune to Slow and Stun) in her off-hand, and Dragonslayer (immune to Fear) in one of her other weapon slots, which of the above immunities applies? All of them? Only the immunities of her primary-hand weapon? It's not showing in her character profile.
Also, if Mazzy has Arbane's Sword (immune to Hold) equipped in one hand, Sword of Arvoreen (immune to Slow and Stun) in her off-hand, and Dragonslayer (immune to Fear) in one of her other weapon slots, which of the above immunities applies? All of them? Only the immunities of her primary-hand weapon? It's not showing in her character profile.
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Comments
You only get the immunities for the weapons in her hands. Off hand does count. You can check them out on the character record screen. The misc immunities that don't have icons show up at the bottom of the right pane.
(I'm looking at IWDee to answer this question, I'm assuming it's the same in BG2ee, but I don't have an active game to check.)
I would be very surprised if they changed it in EE so only main hand weapons gave immunities, since both weapons are touching your body just as closely.
Just as a sidenote, you need to select the character that is using the item. Then the backpack icon in the interface should become usable, and there you will find abilities from items that are equipped on that character.