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Thanks for your replies but we have tried a standard simple PS2 keybaord as well as the installed Microsoft Multimedia keyboard with the same result. The MS Keyboard does have the 'Function Key Lock' button and that is selected before we try the Crtl-F6 combination. Interestingly Crtl-F9 works!!
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Thanks for your replies but we have tried a standard simple PS2 keybaord as well as the installed Microsoft Multimedia keyboard with the same result. The MS Keyboard does have the 'Function Key Lock' button and that is selected before we try the Crtl-F6 combination. Interestingly Crtl-F9 works!!

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Further update - more research seems to show that the problem exists with XP SP3 but not with SP2. So, what keyboard handling changes occured in SP3 - registry changes in the area of keyboard scan codes perhaps?
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Further update - more research seems to show that the problem exists with XP SP3 but not with SP2. So, what keyboard handling changes occured in SP3 - registry changes in the area of keyboard scan codes perhaps?

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One of our customer is having trouble running a DOS application (Symantics Q&amp;A WP) under XP in that not all CRTL+Fn keys work - notably CRTL+F6. If we boot the machine under DOS, CRTL+F6 works fine. I am guessing that it is something to do with XP's handling of keyboard codes under a command prompt but I don't know what. Any one got any ideas?
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One of our customer is having trouble running a DOS application (Symantics Q&A WP) under XP in that not all CRTL+Fn keys work - notably CRTL+F6. If we boot the machine under DOS, CRTL+F6 works fine. I am guessing that it is something to do with XP's handling of keyboard codes under a command prompt but I don't know what. Any one got any ideas?

F key problems with DOS program under XP

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.

Windows XP

Microsoft Disk Operating System (MS-DOS) was an operating system for x86-based personal computers, and traces of it are still found in the Windows operating system. DOS is still used in some embedded systems and for certain legacy 16-bit networks.