IBM Rational Host Access Transformation Services (HATS) is well known as transforming traditional green-screen terminal applications (3270 and 5250 host applications with more formal terminology) to the Web, to a rich client, or to browsers on mobile devices quickly and easily.

HATS integration with WebSphere Portal Server lets data flow freely between HATS, WebSphere Portal, and other Portal applications. All of the relevant features of WebSphere Portal are also available for exploitation within HATS by built-in tooling or straightforward Java development.