
In my line of work I have had to assist customers with setting the proper IRQ for modems so that our software would work properly. Therefore I feel comfortable with having to make that change. Of course like Neo mentioned, it is very rare these days to have to set the IRQ on a pc anymore. Just like it is rare to have to change BIOS settings, unless youre tweaking the pc or setting up security.
A Malexander said, I can't imagine having to mess with the IRQ settings anymore. On my first PC, a 286, I had to always be aware of the IRQ values, since I was using it partly as a testbed for other components. The first mice that were available for PCs were a real problem, since they really messed with modems.
Now, while I am sure I could find out what the current settings are, I am not even sure I would know how to change them in Windows XP.
In the technology fields it has always been a large part of the education process to learn IRQ and memory settings which control each device. I myself have rarely touched any IRQ settings since Windows 98. Now and again I will find a PC with a wannabe chip modem that has problems with something such as this. Windows 2000 and XP do most of the work for you now but in these such cases I generally throw away the modem and install a *Good* modem.