i dont think you can have the same project open on 2 computers
If you are referring to Unity being akin to a live document [like an Office 365 scenario], then No I’m afraid not. You would alternatively use a repository and check against the latest changes, which will be available to review before committing to any main repo/ production-ready version of your game.
I suggest having a look at Unity’s own provision for collaboration: https://www.plasticscm.com/
Hope that helps some 