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The a11y bus is accessed via two mechanisms:
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1) The DBus session bus, service "org.a11y.Bus", method "GetAddress")
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2) The X11 root window property AT_SPI_BUS
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If the "toolkit-accessibility" variable is set, the bus is launched
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immediately (and will be accessible immediately via the X11 property).
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Otherwise, it will be spawned dynamically.