Releases for MS Windows 64bit built with SWI-Prolog 5.10.5, and Mac OS X Snow Leopard built with SWI-Prolog 5.10.4 are also available. September, 13th, 2011. DES 2.5 released with a textual API TAPI for communication with external programs, a bundle of new commands and SQL statements, type inferencing for SQL queries, and new ports. July, 7th. What's the difference between Acid and Base? Bases are the chemical opposite of acids. Acids are defined as compounds that donate a hydrogen ion H to another compound called a base. Traditionally, an acid from the Latin acidus or acere meaning sour.