How do change all players gui inside a normal script? without using remote functions [Not Answered]

How do change all players gui inside a normal script?

How do i change all players playergui using a normal script in the workspace. I wan't to change the text of the textlabel for all players, The location of what i wanna change StarterGui.ScreenGui.TextLabel.Text.

P.S if possible i don't wanna use remote functions. But else something like this. --edited

while true do

    local players = -- refers the variable for all players

    for i = 1, 30, - 1 do
        players.PlayerGui.ScreenGui.Textlabel.Text = i
        if i == 0 then
            break
        end
    end

end