The heart of the MetaEdit+ environment is the Object Repository. It is located on a server, or in the case of a single user version of MetaEdit+ on a local disk. Alternatively, if your computer can access a network drive, the repository can be located there, allowing remote work and a measure of non-simultaneous data sharing: for the latter each user must of course have a MetaEdit+ license.

All information in MetaEdit+ is stored in the Object Repository, including language definitions, diagrams, matrices, objects, properties, and even font selections. Hence, modification of system designs (or even modeling languages) in one tool or MetaEdit+ client is automatically reflected everywhere it appears, guaranteeing consistent and up to date information. Similarly, generators are based directly on the information stored in the repository. Only temporary data such as which windows are open and where, which varies between users and platforms and thus cannot be shared, is not stored.