Matej Košík kosik at fiit.stuba.sk
Sun Oct 9 22:38:37 CEST 2005

```Hello,

Could somebody please explain me why this:

\vfil abc\vfil\bye

doesn't have the same effect as this:

\vbox to \vsize {
\vfil
abc
\vfil
}
\bye

The former one is simpler and thus nicer. But there \vfil-s seem to be
ignored. I do not understand why because as far as my humble knowledge,
TeX starts to process the input in vertical mode. So the initial \vfil
shouldn't be ignored.

I would really appreciate some explanation or some link to a relevant
information. I do not understand the horizontal/vertical mode stuff very
well.