BPX doesn't work on INT 20H in VxD

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Problem:

BPX (INT3) doesn't work when set at an INT 20H call in  a VxD.

Resolution:

The VxD handler for INT 20H replaces it with a CALL;

this overwrites the BPX, and so it is lost. There is no way around this.

Old KB# 11516
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