A system accesses, from a first computer program written in a first computer language, functionality available through a second computer program written in a second computer language. The system has an interface intermediate the first and second programs for enabling access between the first program and the second program. The interface includes (a) a first handler in the second computer language for receiving messages from the functionality and (b) a second handler for retrieving messages, via the interface, that the first handler receives. The second handler is part of the first program.