I/O Manager Routines
All kernel-mode drivers except video and SCSI miniport drivers and NDIS drivers call IoXxx routines.
References for the IoXxx routines are in alphabetical order.
For an overview of the functionality of these routines, see Summary of Kernel-Mode Support Routines.
The following routine is for system use. Do not use it in your driver.
Build date: 5/2/2013