Aaaaaactually, ACADE does NOT support multiple users, technically. (It doesn't even support multiple paperspace layouts.) Right out of the box, it is a stand-alone, single-user environment. There are tools provided that enable you to set up the software for multiple users, but unless you employ them then the software by default puts everything onto the local hard drive. You have to make your multiple user environment conform to ACADE, not the other way around.
If you want management for multiple users, you could use Vault. That's what it's for. But it still won't let you do what you want.
IMO, you're expecting a lot here, not just from ACADE, but from most any software. Think about it from a software programmer's point of view: how can you preserve the edits made by two parties, working in a single file simultaneously in real time? With the temp files related to those edits being kept on two different hard drives? I can't think of a software, any kind of software, that does this. Not even our $9,000 inventory software. Always, one user will take precedence over another. That's why you see 'this file is locked for editing' boxes in Windows. And don't forget, ACADE coordinates with other programs: Excel, Access, Notepad, etc. To do what you want, all of those other programs would also have to support the same functionality.
Bottom line is, a person will have to step in and manage this.
Jim

Jim Seefeldt
Electrical Engineering Technician