Windows interrupt priorities are called IRQLs, see https://blogs.msdn.microsoft.com/doronh/2010/02/02/what-is-irql/ https://blogs.msdn.microsoft.com/doronh/2010

Windows interrupt priorities are called IRQLs, see https://blogs.msdn.microsoft.com/doronh/2010/02/02/what-is-irql/ https://blogs.msdn.microsoft.com/doronh/2010/02/02/what-is-i... for a discussion. Mostly PnP decides the levels, unless you have multiple IRQs and you need to specify the priority.