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 Absolute Addresses
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     In protected mode, selectors do not refer directly to physical
     addresses, so if you attempt to use a selector:offset address to obtain
     an absolute physical (or linear) address, you are not likely to receive
     what you expect.

     Except when DPMI is active, CA-Clipper/ExoSpace offers transparent
     access to the most frequently used absolute hex segment addresses--for
     the BIOS data area, the system ROM BIOS, and various video memory and
     optional ROM areas.  The default transparent selectors are:

     0x40

     0x9F00
     0x9F40
     0x9F80
     0xA000
     0xA200
     0xA400
     . . .          (every 0x200)
     0xFE00

     Except for selector 0x40, there is no transparent addressing under DPMI.

     To manage the real-mode interrupt vectors, use DOS function 25h or 35h,
     or the CA-Clipper/ExoSpace library functions instead of absolute
     addresses.