> About the only thing I like about Tex better is it does > multiple passes so you can do forward references. > Troff makes that hard but it is doable.
I don't think TeX actually does that by itself. *You* have to call TeX multiple times. Forward references work by writing the required information to an external file (e.g., for LaTeX the .aux file), which is read when the manuscript is processed a further time. With groff, you can also use a macro package that does something similar, so I think there is no fundamental difference in this regard.
