Microsoft discourages vendors from making kernel-level changes in 32-bit
systems, but does not programmatically prevent this. This is because 32-bit software
has been around for a long time and is already fully entrenched in the market.
Making this change to these systems would break many of the software packages
in use today because of compatibility issues. The introduction of 64-bit systems
provided Microsoft with an opportunity to introduce this new security feature with
much less impact on the community.
Previously in 32-bit system, vendors would use these undocumented means to ...
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