Master project

I have created a master project by opening the resource pool and then selecting the third option creating a master file.

If I save this master file now, will project know that this is my master file tied to the resource pool? i.e. whenever I tie a new project to the resource pool will the master file add it in automatically when I open it or do I need to create a new master file each time when opening the resource pool?

also, when editing projects in the master file (levelling for instance), is this automatically updated in the individual project plans linked to the master file and the resource pool?