This is the Gnome Accessibility Project's Assistive Technology Service Provider Interface. It allows accessibility applications and assistive technologies to announce their respective existence to each other. This version of at-spi is a major break from previous versions. It has been completely rewritten to use D-Bus rather than ORBIT / CORBA for its transport protocol. WWW: http://www.linuxfoundation.org/en/AT-SPI_on_D-Bus