widgets and variables, asynchronous execution of functions associated with variables and events, dynamic loading of user compiled subroutines, and many other features. Execution is by a rather efficient interpreter. A+ was created at Morgan Stanley. Primarily used in a computationally-intensive business environment, many critical applications written in A+ have withstood the demands of real-world developers over many years. Being written in an interpreted language, A+ applications are easily ported, if not inherently portable due to application-specific platform dependencies. This site is provided to help users get the most out of A+.