Yes. Multiple people can work simultaneously in the same project. Here are the rules:

1. The project just needs to be on a network share that is visible to all users.
2. Though the project can be opened and edited by multiple users a drawing has only a single concurrent editor. The person that opens the drawing first will get that drawing in edit mode. Anyone opening that same drawing after will be in read only mode.
3. Name and number assignment use pessimistic locking of the database. This means that while user A is in the middle of a name or number assignment User B attempting to assign names or numbers in the same table will be locked out. A message box appears informing the user that User A is assigning a SysName or Cable Number and that User B will have to wait until that operation is complete. That message box presents a [Retry] button letting User B reattempt.
4. If using VistaDB databases over network shares you may experience a situation where the database can get locked. You will then need to run a VistaDB Pack operation to unlock the database. It is for this reason that we recommend SQL server in multi-user environments. Though this is not a requirement.