For instance a counting downgui from 10 to 0, how would I get everyone's gui to count down from 10 to 0 from a script in a model, which is in workspace. Thanks.
There are a couple of ways this can be done. You can use a numbervalue object which will be updated on the server. From the client, you can read that value and set the text value of your gui.
You can also use a remote event to tell all the clients to update their gui. Though I believe this could be rather inefficient.