Does DOS/4G provide null pointer checking?
DOS/4G will trap references to the first sixteen bytes of physical memory if you set the NullPtrCheck option to ON. As of release 1.95, DOS/4G traps both reads and writes. Prior to this, it only trapped writes. You may experience problems if you set NullPtrCheck ON and use some versions of the WATCOM WVIDEO debugger with a 1.95 or later extender. Note that DOS/4G also provides a paged null-pointer checking feature.
