TUT needs (how caching the part of template)

[Joss]

Hello,
there are some MODs which are heavy for server when invokes from each page. E.g.
http://www.4homepages.de/forum/index.php?topic=24677.msg145576#msg145576

I've moved the part of this mod from page_header.php to index.php, because it heavy for every page. But I wonder is there a possibility to cache such pieces of code?

Is there any tutorial how to cache a part of template?

Thanks!