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I8042prt uses a start information request to pass a pointer to a device's interrupt object to the upper-level drivers in its device stack. After a device is started, the filter driver can use the interrupt object to synchronize its operation with the interrupt service routine. Filter drivers should only use the interrupt object in calls to KeSynchronizeExecution.
I8042prt passes the interrupt object pointer to the top of the device stack by using an IOCTL_INTERNAL_I8042_KEYBOARD_START_INFORMATION request for a keyboard device and an IOCTL_INTERNAL_I8042_MOUSE_START_INFORMATION request for a mouse device. I8042prt synchronously sends a start information request to the top of the device stack after the hardware initialization of a device. After a filter driver receives a start information request, it saves the start information and passes the request down the device stack. I8042prt completes the request.