psview: how much it offers and why we need TeX viewer??

[XIAO Yan]

I am puzzled by what psview can do.  Many applications generate PostScript 
files. But how much psview offers to view these files?
(for that matter, psh).

In the case of LaTex, why we need special viewer for its dvi output even
though we have dvi2ps to output a PS file?  What is the limit for psview?

Acknowledgable answers wanted.

Xiao
<xiaoy at ecf.toronto.edu>