LaTeX.org

The answers in http://tex.stackexchange.com/ didn't work, so I had to post it here.

I edit big documents, so it is useful for me to open the last page after compilation. Normally, the first page is opened, but by using hyperref , I can configure it to open any page at start.
\usepackage[pdftex,pdfstartpage=1]{hyperref}
But there is no variable "lastpage". Can this be done in some ...