SM> Bypassing the BIOS, in this case, means that the interrupt
 SM> vectors are reinitialized with new values.  Therefore, the
 SM> TSR would never get called.
You mean they communicate directly with e.g the IDE interface?
 SM> This is why DOS boot-sector
 SM> viruses don't normally spread under those environments.
"DOS boot-sector viruses" ;-)
[peter]
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