SSK has a variety of additional functionality that the standard loot window does not contain.
-Select which item types will cause the window to pop up. Don't want the window popping up each time you loot something? Select exactly the item types you want to see!
-Auto Sell Items. Allows the player to add recently looted items to a list that will be automatically sold on their next trip to a vendor. Junk is automatically added to this list whenever looted. Couldn't make it to a vendor before logging out? If there were any items in your list, they will be saved for the next time your online.
-Easy Salvaging of recently looted items. Much like the auto sell list, you can create a list of items you want to salvage. By pressing the large salvage button you can cycle through and salvage each one.
-Keep track of money gained for current session. Through the coin purse, you can view how much money you just looted and how much you have looted throughout the course of your current session
The sell list, salvage list, and coin purse can be viewed at anytime by pressing the view button on the main form. Options menu to select when the loot window will display is located in the top left.
To bring up the addon you can type /sskVac or press the button located in the interface menu.