Mike Byrne wrote in a message to David Noon:

 DN> Perhaps you'd like to tell us how you would go about that from inside
 DN> a VDM. Remember that the descriptor tables are not even addressable
 DN> from within the VDM, let alone modifiable.

 MBy> I'm not a virus writer or anything, but I am curious.  Are
 MBy> the descriptor tables not adressable even under DPMI or
 MBy> similar protected-mode protocols? 

Under DPMI, the client application has substantially the same access to
memory as would a native OS/2 application.  There are a couple of
additional levels of indirection if you look under the hood, but the basic
idea is the same.  Since even a native OS/2 application has no destructive
access to memory unless it can trick the operating system or a device
driver into doing its dirty work, neither would a DOS DPMI application.
 
-- Mike


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