I have a user using Fujitsu FI 4530C scanner, and when scanning, the twain drivers steals focus from any other application. You can switch back to the other application and it will steal focus again as soon as it scans the next page. This is the functionality on Win2k, However on WinXP you can switch to Microsoft IE during scanning and IE maintains focus and lets you work while scanning is done in the background. You do get a blinking icon in the taskbar indicating that the scanning window has received events, but it doesn't switch focus. I've uninstalled/reinstalled both scanner driver and Acrobat, but get this same functionality. The user says that this used to work on Win2k, she could use IE while it scanned without losing window focus.
Also, noteworthy, if using outlook on either OS, the scanner steals focus, seems to only not steal focus if using IE. Both systems are using IE 6 SP1. Any hints would be much appreciated. I kind of think it's an OS window focus thing, not the scanner software, but I'm not sure what else to check...since the user says it used to work. I couldn't find anything in the Fujitsu of microsoft KB.