diff --git a/classes/deck/deck.gd b/classes/deck/deck.gd
index 963b9ba..af3a043 100644
--- a/classes/deck/deck.gd
+++ b/classes/deck/deck.gd
@@ -114,24 +114,42 @@ func get_node(uuid: String) -> DeckNode:
 	return nodes.get(uuid)
 
 
-## Attempt to connect two nodes. Returns [code]true[/code] if the connection succeeded.
-func connect_nodes(from_node_id: String, to_node_id: String, from_output_port: int, to_input_port: int) -> bool:
+## Returns [code]true[/code] if the connection between two nodes is legal.
+func is_valid_connection(from_node_id: String, to_node_id: String, from_output_port: int, to_input_port: int) -> bool:
+	# do not connect to self
+	if from_node_id == to_node_id:
+		return false
+	
 	var from_node := get_node(from_node_id)
 	var to_node := get_node(to_node_id)
-	# check that we can do the type conversion
-	var type_a: DeckType.Types = from_node.get_output_ports()[from_output_port].type
-	var type_b: DeckType.Types = to_node.get_input_ports()[to_input_port].type
-	if !DeckType.can_convert(type_a, type_b):
-		DeckHolder.logger.log_deck(
-			"Can not convert from %s to %s." % [DeckType.type_str(type_a), DeckType.type_str(type_b)],
-			Logger.LogType.ERROR
-		)
+	
+	var usage_from: Port.UsageType = from_node.get_output_ports()[from_output_port].usage_type
+	var usage_to: Port.UsageType = to_node.get_input_ports()[to_input_port].usage_type
+	# incompatible usages
+	if (usage_from != Port.UsageType.BOTH) && (usage_to != Port.UsageType.BOTH):
+		if usage_from != usage_to:
+			return false
+	
+	var type_from: DeckType.Types = from_node.get_output_ports()[from_output_port].type
+	var type_to: DeckType.Types = to_node.get_input_ports()[to_input_port].type
+	# incompatible types
+	if !DeckType.can_convert(type_from, type_to):
 		return false
-
-	# refuse duplicate connections
+	
+	# duplicate connection
 	if from_node.has_outgoing_connection_exact(from_output_port, to_node_id, to_input_port):
-		print("no duplicates")
 		return false
+	
+	return true
+
+
+## Attempt to connect two nodes. Returns [code]true[/code] if the connection succeeded.
+func connect_nodes(from_node_id: String, to_node_id: String, from_output_port: int, to_input_port: int) -> bool:
+	if !is_valid_connection(from_node_id, to_node_id, from_output_port, to_input_port):
+		return false
+	
+	var from_node := get_node(from_node_id)
+	var to_node := get_node(to_node_id)
 
 	if to_node.has_incoming_connection(to_input_port):
 		var connection: Dictionary = to_node.incoming_connections[to_input_port]
@@ -139,7 +157,6 @@ func connect_nodes(from_node_id: String, to_node_id: String, from_output_port: i
 		var node_out_port: int = connection.values()[0]
 		disconnect_nodes(node_id, to_node_id, node_out_port, to_input_port)
 
-
 	if is_group && emit_group_signals:
 		nodes_connected_in_group.emit(from_node_id, to_node_id, from_output_port, to_input_port, self)
 
diff --git a/classes/deck/deck_node.gd b/classes/deck/deck_node.gd
index 459b12a..0036733 100644
--- a/classes/deck/deck_node.gd
+++ b/classes/deck/deck_node.gd
@@ -74,23 +74,40 @@ signal renamed(new_name: String)
 
 
 ## Add an input port to this node. Usually only used at initialization.
-func add_input_port(type: DeckType.Types, label: String, descriptor: String = "") -> void:
-	add_port(type, label, PortType.INPUT, get_input_ports().size(), descriptor)
+func add_input_port(
+		type: DeckType.Types,
+		label: String,
+		descriptor: String = "",
+		usage: Port.UsageType = Port.UsageType.BOTH) -> void:
+	add_port(type, label, PortType.INPUT, get_input_ports().size(), descriptor, usage)
 
 
 ## Add an output port to this node. Usually only used at initialization.
-func add_output_port(type: DeckType.Types, label: String, descriptor: String = "") -> void:
-	add_port(type, label, PortType.OUTPUT, get_output_ports().size(), descriptor)
+func add_output_port(
+		type: DeckType.Types,
+		label: String,
+		descriptor: String = "",
+		usage: Port.UsageType = Port.UsageType.BOTH) -> void:
+	add_port(type, label, PortType.OUTPUT, get_output_ports().size(), descriptor, usage)
 
 
 ## Add a virtual port to this node. Usually only used at initialization.
-func add_virtual_port(type: DeckType.Types, label: String, descriptor: String = "") -> void:
-	add_port(type, label, PortType.VIRTUAL, get_virtual_ports().size(), descriptor)
+func add_virtual_port(
+		type: DeckType.Types,
+		label: String,
+		descriptor: String = "",
+		usage: Port.UsageType = Port.UsageType.BOTH) -> void:
+	add_port(type, label, PortType.VIRTUAL, get_virtual_ports().size(), descriptor, usage)
 
 
 ## Add a port to this node. Usually only used at initialization.
-func add_port(type: DeckType.Types, label: String, port_type: PortType, index_of_type: int, descriptor: String = "") -> void:
-	var port := Port.new(type, label, ports.size(), port_type, index_of_type, descriptor)
+func add_port(type: DeckType.Types,
+		label: String,
+		port_type: PortType,
+		index_of_type: int,
+		descriptor: String = "",
+		usage: Port.UsageType = Port.UsageType.BOTH) -> void:
+	var port := Port.new(type, label, ports.size(), port_type, index_of_type, descriptor, usage)
 	ports.append(port)
 	port_added.emit(ports.size() - 1)
 	port.value_updated.connect(
diff --git a/classes/deck/nodes/general/is_equal.gd b/classes/deck/nodes/general/is_equal.gd
index d1169fd..674eb40 100644
--- a/classes/deck/nodes/general/is_equal.gd
+++ b/classes/deck/nodes/general/is_equal.gd
@@ -32,3 +32,14 @@ func _value_request(on_port: int) -> Variant:
 	var b = await resolve_input_port_value_async(1)
 	
 	return a == b
+
+
+func _receive(on_port: int, data: Variant, extra_data: Array = []) -> void:
+	if on_port == 0:
+		var b = await resolve_input_port_value_async(1)
+		if data == b:
+			send(0, true)
+	else:
+		var b = await resolve_input_port_value_async(0)
+		if data == b:
+			send(0, true)
diff --git a/classes/deck/nodes/test/test_connection_types.gd b/classes/deck/nodes/test/test_connection_types.gd
new file mode 100644
index 0000000..1f075b8
--- /dev/null
+++ b/classes/deck/nodes/test/test_connection_types.gd
@@ -0,0 +1,33 @@
+# (c) 2023-present Eroax
+# (c) 2023-present Yagich
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+extends DeckNode
+
+
+func _init() -> void:
+	name = "Test Usage"
+	node_type = name.to_snake_case()
+
+	add_input_port(
+		DeckType.Types.ANY, "Both", "", Port.UsageType.BOTH
+	)
+	
+	add_input_port(
+		DeckType.Types.ANY, "Trigger", "", Port.UsageType.TRIGGER
+	)
+	
+	add_input_port(
+		DeckType.Types.ANY, "Value", "", Port.UsageType.VALUE_REQUEST
+	)
+	
+	add_output_port(
+		DeckType.Types.ANY, "Both", "", Port.UsageType.BOTH
+	)
+	
+	add_output_port(
+		DeckType.Types.ANY, "Trigger", "", Port.UsageType.TRIGGER
+	)
+	
+	add_output_port(
+		DeckType.Types.ANY, "Value", "", Port.UsageType.VALUE_REQUEST
+	)
diff --git a/classes/deck/nodes/twitch/twitch_chat_received.gd b/classes/deck/nodes/twitch/twitch_chat_received.gd
index cc38e6b..1a693ac 100644
--- a/classes/deck/nodes/twitch/twitch_chat_received.gd
+++ b/classes/deck/nodes/twitch/twitch_chat_received.gd
@@ -14,10 +14,10 @@ func _init():
 	node_type = "twitch_chat_received"
 	description = "Receives Twitch chat events from a Twitch connection."
 
-	add_output_port(DeckType.Types.STRING, "Username")
-	add_output_port(DeckType.Types.STRING, "Message")
-	add_output_port(DeckType.Types.STRING, "Channel")
-	add_output_port(DeckType.Types.DICTIONARY, "Tags")
+	add_output_port(DeckType.Types.STRING, "Username", "", Port.UsageType.TRIGGER)
+	add_output_port(DeckType.Types.STRING, "Message", "", Port.UsageType.TRIGGER)
+	add_output_port(DeckType.Types.STRING, "Channel", "", Port.UsageType.TRIGGER)
+	add_output_port(DeckType.Types.DICTIONARY, "Tags", "", Port.UsageType.TRIGGER)
 
 	add_output_port(
 		DeckType.Types.BOOL,
@@ -37,7 +37,10 @@ func _event_received(event_name : StringName, event_data : Dictionary = {}):
 	message = event_data.message
 	channel = event_data.channel
 	tags = event_data
-
+	send(0, username)
+	send(1, message)
+	send(2, channel)
+	send(3, tags)
 	send(4, true)
 
 
diff --git a/classes/deck/port.gd b/classes/deck/port.gd
index 110fcbc..3b4ea53 100644
--- a/classes/deck/port.gd
+++ b/classes/deck/port.gd
@@ -7,6 +7,12 @@ class_name Port
 ## Ports are used for connections between [DeckNode]s and can contain data that is passed between
 ## them on a node.
 
+enum UsageType {
+	TRIGGER, ## Port can send or receive events, not request values.
+	VALUE_REQUEST, ## Port can request values and respond to value requests, not send or receive events.
+	BOTH, ## Port can send or receive events [b]and[/b] request and respond to value requests.
+}
+
 ## The type index of this port.
 var type: DeckType.Types
 ## The label of this port. Used by the renderer to display. How it's displayed depends on the renderer
@@ -22,6 +28,8 @@ var value_callback: Callable
 
 ## The type of this port (input, output or virtual)
 var port_type: DeckNode.PortType
+## The usage type of this port (see [enum UsageType]).
+var usage_type: UsageType
 ## The local index of this port.
 var index_of_type: int
 ## The global index of this port.
@@ -41,6 +49,7 @@ func _init(
 		p_index_of_type: int,
 		p_descriptor: String = "",
 #		p_value_callback: Callable = Callable(),
+		p_usage_type: UsageType = UsageType.BOTH,
 		) -> void:
 	type = p_type
 	label = p_label
@@ -50,6 +59,7 @@ func _init(
 	port_type = p_port_type
 	index_of_type = p_index_of_type
 	index = p_index
+	usage_type = p_usage_type
 
 
 func set_value(v: Variant) -> void:
diff --git a/graph_node_renderer/deck_node_renderer_graph_node.gd b/graph_node_renderer/deck_node_renderer_graph_node.gd
index 377c594..d5131f6 100644
--- a/graph_node_renderer/deck_node_renderer_graph_node.gd
+++ b/graph_node_renderer/deck_node_renderer_graph_node.gd
@@ -19,6 +19,11 @@ const TYPE_COLORS := {
 	DeckType.Types.ANY: Color.WHITE,
 }
 
+const PORT_USAGE_ICONS := {
+	Port.UsageType.TRIGGER: preload("res://graph_node_renderer/textures/port_trigger_12.svg"),
+	Port.UsageType.VALUE_REQUEST: preload("res://graph_node_renderer/textures/port_data_request_12.svg"),
+	Port.UsageType.BOTH: preload("res://graph_node_renderer/textures/port_any_12.svg"),
+}
 
 ## Setups up all the properties based off [member node].  Including looping through
 ## [method DeckNode.get_all_ports()] and setting up all the descriptors.
@@ -204,4 +209,6 @@ func update_port(port: Port) -> void:
 		port.port_type == DeckNode.PortType.OUTPUT,
 		port.type,
 		TYPE_COLORS[port.type],
+		PORT_USAGE_ICONS[port.usage_type],
+		PORT_USAGE_ICONS[port.usage_type],
 	)
diff --git a/graph_node_renderer/deck_renderer_graph_edit.gd b/graph_node_renderer/deck_renderer_graph_edit.gd
index c781cc2..02095d3 100644
--- a/graph_node_renderer/deck_renderer_graph_edit.gd
+++ b/graph_node_renderer/deck_renderer_graph_edit.gd
@@ -87,6 +87,13 @@ func attempt_connection(from_node_name: StringName, from_port: int, to_node_name
 			)
 		dirty = true
 
+
+func _is_node_hover_valid(from_node: StringName, from_port: int, to_node: StringName, to_port: int) -> bool:
+	var from_node_renderer: DeckNodeRendererGraphNode = get_node(NodePath(from_node))
+	var to_node_renderer: DeckNodeRendererGraphNode = get_node(NodePath(to_node))
+	
+	return deck.is_valid_connection(from_node_renderer.node._id, to_node_renderer.node._id, from_port, to_port)
+
 ## Receives [signal GraphEdit.disconnection_request] and attempts to disconnect the two [DeckNode]s
 ## involved, utilizes [NodeDB] for accessing them.
 func attempt_disconnect(from_node_name: StringName, from_port: int, to_node_name: StringName, to_port: int) -> void:
diff --git a/graph_node_renderer/textures/port_any_12.svg b/graph_node_renderer/textures/port_any_12.svg
new file mode 100644
index 0000000..cce736c
--- /dev/null
+++ b/graph_node_renderer/textures/port_any_12.svg
@@ -0,0 +1 @@
+<svg width="12" height="12" xmlns="http://www.w3.org/2000/svg"><circle cx="6" cy="6" r="5" fill="#dedede" stroke="#fff" stroke-width="2"/></svg>
\ No newline at end of file
diff --git a/graph_node_renderer/textures/port_any_12.svg.import b/graph_node_renderer/textures/port_any_12.svg.import
new file mode 100644
index 0000000..74bdff6
--- /dev/null
+++ b/graph_node_renderer/textures/port_any_12.svg.import
@@ -0,0 +1,37 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c0qh34njvu4xt"
+path="res://.godot/imported/port_any_12.svg-64aca00b3bf28084e8a38d718780e0ff.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://graph_node_renderer/textures/port_any_12.svg"
+dest_files=["res://.godot/imported/port_any_12.svg-64aca00b3bf28084e8a38d718780e0ff.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false
diff --git a/graph_node_renderer/textures/port_data_request_12.svg b/graph_node_renderer/textures/port_data_request_12.svg
new file mode 100644
index 0000000..e73eaab
--- /dev/null
+++ b/graph_node_renderer/textures/port_data_request_12.svg
@@ -0,0 +1 @@
+<svg width="12" height="12" xmlns="http://www.w3.org/2000/svg"><rect x="1" y="1" width="10" height="10" rx="1" ry="1" fill="#dedede" stroke="#fff" stroke-width="2"/></svg>
\ No newline at end of file
diff --git a/graph_node_renderer/textures/port_data_request_12.svg.import b/graph_node_renderer/textures/port_data_request_12.svg.import
new file mode 100644
index 0000000..ebefa7d
--- /dev/null
+++ b/graph_node_renderer/textures/port_data_request_12.svg.import
@@ -0,0 +1,37 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://b5houge8j0lij"
+path="res://.godot/imported/port_data_request_12.svg-da181e9908b91f72dfc70f3dd7196720.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://graph_node_renderer/textures/port_data_request_12.svg"
+dest_files=["res://.godot/imported/port_data_request_12.svg-da181e9908b91f72dfc70f3dd7196720.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false
diff --git a/graph_node_renderer/textures/port_trigger_12.svg b/graph_node_renderer/textures/port_trigger_12.svg
new file mode 100644
index 0000000..02cc890
--- /dev/null
+++ b/graph_node_renderer/textures/port_trigger_12.svg
@@ -0,0 +1 @@
+<svg width="12" height="12" xmlns="http://www.w3.org/2000/svg"><path d="M9.75 6 1 10.25 1 1.75Z" fill="#dedede" stroke="#fff" stroke-width="2"/></svg>
\ No newline at end of file
diff --git a/graph_node_renderer/textures/port_trigger_12.svg.import b/graph_node_renderer/textures/port_trigger_12.svg.import
new file mode 100644
index 0000000..be616c0
--- /dev/null
+++ b/graph_node_renderer/textures/port_trigger_12.svg.import
@@ -0,0 +1,37 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://tbxgx46ch210"
+path="res://.godot/imported/port_trigger_12.svg-ddfb2ada8bfb56f098470a2797045ba0.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://graph_node_renderer/textures/port_trigger_12.svg"
+dest_files=["res://.godot/imported/port_trigger_12.svg-ddfb2ada8bfb56f098470a2797045ba0.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false