Under Microsoft Windows, Harbour is more stable but less well-documented than Clipper, but has multi-platform capability and is more transparent, customizable and can run from a USB flash drive. As the same compiler is available for all of the above operating systems, there is no need for recoding to produce identical products for different platforms, except when operating system dependent features are used. Unlike Java which is intended to be write once, run anywhere, Harbour aims to be write once, compile anywhere. Although this is true, xBase is more than a simple database system as the same time xBase languages using purely DBF can not provide full concept of a real RDBMS. XBase technologies often is confused with a RDBMS software.
MySQL, PostgreSQL, SQLite, Firebird, Oracle are examples of databases which Harbour can connect. Harbour also offers ODBC support by means of an OOP syntax, and ADO support by means of OLE. NETIO and LetoDB provide remote access over TCP protocol. DBFNTX implementation has almost same functionality of DBFCDX and RDDSIX. Third-party RDDs, like RDDSQL, RDDSIX, RMDBFCDX, Advantage Database Server, and Mediator exemplify some of the RDD architecture features.
The RDD architecture allows for inheritance, so that a given RDD may extend the functionality of other existing RDD(s). In Harbour multiple RDDs can be used in a single application, and new logical RDDs can be defined by combining other RDDs. It offers multiple RDDs such as DBF, DBFNTX, DBFCDX, DBFDBT and DBFFPT. Harbour extends the Clipper Replaceable Database Drivers (RDD) approach. In 2009 Harbour was substantially redesigned, mainly by Viktor Szakáts and Przemyslaw Czerpak. Harbour is a synonym for port (where ships dock), and Harbour is a port of the Clipper language. The name "Harbour" was proposed by Linares, it is a play on a Clipper as a type of ship. Antonio Linares founded the Harbour project and the implementation was started in March 1999. The idea of a free software Clipper compiler had been floating around for a long time and the subject has often cropped up in discussion on.
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