From "I also tried running Xinerama instead of twviewview." I assume you are using Linux. I don't know tigervnc, but most X programs support the -geometry parameter, which works like this:
myprogram -geometry <width>x<height>+<xoffset>+<yoffset>
so you probably want to pass your tigervnc
-geometry 1600x1200+0+0
In fact, I think every Xlib-related program has this feature, so your chances of tigervnc supporting a geometry parameter are pretty good.
user1129682
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