The VistA architecture includes a database management system (DBMS) called File Manager (FileMan), and applications built on top of FileMan. FileMan provides structure for the data in VistA's database, and is the interface to VistA's data. Applications use FileMan application programmer interfaces (API’s) to manage, structure, persist, and retrieve data in the VistA database. End-users use FileMan to enter, structure, query, sort, print, and make reports of VistA data.FileMan Variants of FileMan are used as the DBMS in other Federal electronic health records systems (DoD, IHS, VA).