How to get consolegetkey from 2 users

I am trying to learn F # by creating a game, Tron. So this is a multiplayer game and I need to have a console key for both players. One uses ZQSD, the other uses arrows.

    let mutable switchb = new pos(-1, 0)
    let mutable switcha = new pos(1, 0)
    let key_info = Console.ReadKey().Key
        if key_info = ConsoleKey.UpArrow then
           switchb.y <- switchb.y - 1
        else if key_info = ConsoleKey.DownArrow then
           switchb.y <- switchb.y + 1
        else if key_info = ConsoleKey.RightArrow then
           switchb.x <- switchb.x + 1
        else if key_info = ConsoleKey.LeftArrow then
           switchb.x <- switchb.x - 1
        if key_info = ConsoleKey.Z then
           switcha.y <- switcha.y - 1
        else if key_info = ConsoleKey.S then
           switcha.y <- switcha.y + 1
        else if key_info = ConsoleKey.D then
           switcha.x <- switcha.x + 1
        else if key_info = ConsoleKey.Q then
           switcha.x <- switcha.x - 1

      

        
        
        
      

    

The problem is that I can only have one input over the round loop.

Do I need to create a thread that will catch the input of the second player? I don't know what I can do.

Thanks in advance.