If the host system is dual-head and the client system inside VMWare doesn't know about this, then I'd consider this to be a VMWare problem. You can use http://ktown.kde.org/~seli/fakexinerama/ to force a specific Xinerama setup.
If the host system is dual-head and the client system inside VMWare doesn't know about this, then I'd consider this to be a VMWare problem. You can use http:// ktown.kde. org/~seli/ fakexinerama/ to force a specific Xinerama setup.