HostAPI.getScreenSlot

Gets the item in a screen slot
The slot is either their numerical id (0 indexed) or the slot string, as used in the /item command
If the player is not currently in a screen, the screen has no slots, or the slot index is greater than the maximum, returns nil

overload 1:
                        
host:getScreenSlot(slot)  
 Method Property Fluent Description Representation
slot accepts a String String 
   
Return Value an ItemStack ItemStack 
   
overload 2:
                        
host:getScreenSlot(slot)  
 Method Property Fluent Description Representation
slot accepts an Integer Integer 
   
Return Value an ItemStack ItemStack