To work with DEVONthink in a team, you have two options, which both have their own advantages and disadvantages:
Install DEVONthink on each of your team’s Macs and synchronize your databases between all of them, either directly via Bonjour or via a storage location like a WebDAV server or a shared Dropbox account. Advantage: You can use the full functionality of DEVONthink at all workplaces. Disadvantages: You need a license with seats for all Macs running DEVONthink. In addition, a copy of the database is kept on every Mac taking part in the sync circle and occupies storage space. All participants have full access to all databases shared with them.
You run DEVONthink Server on one Mac which holds the databases. All other workplaces access your databases via a web interface provided by the server Mac. Advantages: User and permission management lets you control who has access to which databases. The number of workplaces accessing the server is not limited, and you can also use Windows or Linux PCs to connect to the server via web browser. You don’t need to buy additional seats to accommodate more users. Disadvantage: The web interface offers only a part of DEVONthink’s feature set.
DEVONthink Server is the same application as DEVONthink but with an additional server component. Its license comes with two seats so you can install it on up to two Macs and use it just like any of the other editions (you don’t have to use the server component on a Mac not being used as a server).