Rule at the middle of a page

Question

Is it possible to draw a (dotted) horizontal rule at the middle of the page (same distance from the top as from the bottom) independent of the rest of the text (perhaps in some way overlayed over the text)?

I just want it as a help line for a special purpose, it will removed in the final version of the text so it doesn't matter if it overlays text.

Answer 1

Here's one possibility using the background package:

\documentclass{article}
\usepackage[a6paper]{geometry}% just for the example
\usepackage{background}
\usepackage{lipsum}% just to generate text for the example

\backgroundsetup{
  scale=1,
  angle=0,
  color=blue,
  contents={\tikz\draw[ultra thick,dotted] (current page.west) -- (current page.east);}
}

\begin{document}

\lipsum[1-3]

\end{document}

To make the line disappear, you can simply change

\usepackage{background}

to

\usepackage[pages=some]{background}