http://hobbes.nmsu.edu/cgi-bin/h-search?key=vcompat
This is a VDD to fix some issues in VDMs to further enhance compatibility. It contains many fixes, some of which are user-controllable via Properties. The latest version is on Hobbes.
http://hobbes.nmsu.edu/cgi-bin/h-search?key=vcompat
Source: OS/2 Warp News and Rumors