diff --git a/mod/control.lua b/mod/control.lua
index 8bab831..5d06650 100644
--- a/mod/control.lua
+++ b/mod/control.lua
@@ -1,11 +1,20 @@
 
 require "util"
 
-
 --[[///////////////////
 	UNIVERSAL FUNCTIONS
 	///////////////////]]
 
+--compare an item to a table
+function contains_item(item, table)
+	for k, item in ipairs(table) do
+		if item == table then
+			return true
+		else
+			return false
+		end
+	end
+end
 
 --verify state of entity and call the appropriate functions
 function entity_placed(event)
@@ -22,7 +31,17 @@ function check_cursor_stack(player_index)
 	local cursor_item = player.cursor_stack
 	return cursor_item
 end
+
+function add_to_inv(item, entity)
 	
+end
+
+function clear_inv(item.name, player_index)
+	local player = game.players[player_index]
+	player.clean_cursor(name)
+	player.remove_item(name)
+end
+
 script.on_event(defines.events.on_built_entity, entity_placed)
 script.on_event(defines.events.on_robot_built_entity, entity_placed)
 
@@ -41,27 +60,52 @@ function Position.add(pos1, pos2)
 end
 
 function make_target(event)
+	--change this in order to change the reactor detection range.
 	local range = 1
 	local offsets = {{0, range}, {range, 0}, {0, -range}, {-range, 0}}
 	local entity = event.created_entity
 	local entity_position = entity.position	
 	for _, offset in pairs(offsets) do
 		local adj_pos = {x = entity_position.x + offset.x, y = entity_position.y + offset.y}
-		local adjacent_reactor = surface.get_tile(adj_pos.x, adj_pos.y)
-		if adjacent_reactor and adjacent_reactor.name == "nuclear-reactor" then
-			--true
+		local adjacent_reactor = surface.get_t(adj_pos.x, adj_pos.y)
+		local surface = adjacent_reactor.
+		if adjacent_reactor and adjacent_reactor.type == "reactor" then
+			game.surfaces[].create_entity()
 		else
 			--false
-		end
+       end
 	end
 	return adjacent_tiles
 end
 --neutron target - neutron manager
 
-script.on_event(defines.events.on_gui_opened, function(event) if event.entity.name == "neutron-target" then neutron_target_gui_open = true end end)
-script.on_event(defines.events.on_gui_closed, function(event) if event.entity.name == "neutron-target" then neutron_target_gui_open = false end end)
-
-function remove_neutrons()
-	
+function remove_neutrons(player_index)
+	local remove_neutrons.player_index = player_index
+	if neutron_target_gui_open == true then
+		script.events.on_tick(clear_inv("neutron", player_index))
+	else
+		game.players[player_index].print("debug.neutron.gui.closed")
+	end
 end
 script.on_tick(remove_neutrons)
+
+function generate_neutrons(entity)
+	
+end
+script.on_tick(generate_neutrons)
+
+--gui handler
+script.on_event(defines.events.on_gui_opened, function(event)
+	if event.entity.name == "neutron-target" then
+		neutron_target_gui_open = true
+		local player_index = event.player_index
+		remove_neutrons(player_index)
+	end
+end)
+
+script.on_event(defines.events.on_gui_closed, function(event)
+	if event.entity.name == "neutron-target" then
+		neutron_target_gui_open = false
+	end
+end)
+