Objective: Activate a server script with a local script (.KeyDown() event).

Solution: Remote Event or Function

Remote functions are recommended if you want to return a value back to the client. Otherwise, remote events are recommended.

TO ACCESS THE SERVER

REMOTE EVENT

• :FireServer()

• .OnServerEvent:connect(func)

-- LOCAL SCRIPT EXAMPLE

Mouse = game.Players.LocalPlayer:GetMouse()
RemoteEvent = game.ReplicatedStorage:WaitForChild("RemoteEvent")

Mouse.KeyDown:connect(function (key)
    key = key:lower()
    if key == "f" then
        RemoteEvent:FireServer()
    end
end

-- SERVER SCRIPT EXAMPLE
RemoteEvent = Instance.new("RemoteEvent", game.ReplicatedStorage)

function CallThisFunction()
    print("server called!")
end

RemoteEvent.OnServerEvent:connect(CallThisFunction)
-- Literally almost like any other event

TO ACCESS THE SERVER AND RETURN A VALUE BACK TO THE CLIENT

REMOTE FUNCTION

• :InvokeServer()

• function --[[RemoteFunction]].OnServerInvoke()

-- LOCAL SCRIPT EXAMPLE

Mouse = game.Players.LocalPlayer:GetMouse()
RemoteFunction = game.ReplicatedStorage:WaitForChild("RemoteFunction")

Mouse.KeyDown:connect(function (key)
    key = key:lower()
    if key == "f" then
        print(RemoteFunction:InvokeServer())
    end
end

-- SERVER SCRIPT EXAMPLE
RemoteFunction = Instance.new("RemoteFunction", game.ReplicatedStorage)

function RemoteFunction.OnServerInvoke()
    return "server called!"
end
-- Literally almost like any other function

NOTE: Client to server communication means that an additional "player" argument will be included (first argument).

-- LOCAL
RemoteEvent = game.ReplicatedStorage:WaitForChild("RemoteEvent")

RemoteEvent:FireServer()

-- SERVER
RemoteEvent = Instance.new("RemoteEvent", game.ReplicatedStorage)

RemoteEvent.OnServerEvent:connect(function (player)
    print(player)
end)
-- OUTPUT: Player instance

REFERENCE

Remote Event

• CLIENT TO SERVER

  • :FireServer()

  • .OnServerEvent

• SERVER TO CLIENT

  • :FireClient()

  • .OnClientEvent

Remote Function

• CLIENT TO SERVER

  • :InvokeServer

  • .OnServerInvoke()

• SERVER TO CLIENT

  • :InvokeClient

  • .OnClientInvoke

Unfortunately, this will be difficult to explain without using the wiki so here it goes:

Remote functions can be used to communicate between scripts, they're normally used with filteringenabled on. If you're not planning to use filtering enabled they can be sent via bind able events. However for arguments sake I will use remote functions.

You can send messages like this:

game.Workspace.RemoteFunction:InvokeServer(parameters)

And you can receive messages like this:

function game.Workspace.RemoteFunction.OnServerInvoke(ply,parameters)
    --code
end

With Remote Functions the ply value is added automatically. If you wanted to send information back to a user you would have to use InvokeClient(ply,parameters) and receive messages via OnClientInvoke(parameters)

Any further questions? I'd be happy to answer them!