[Typo3] tag to jump to a typo page

[RLB]

Is there a tag that would make it possible to link to another page in the
typo3 table list?  I know the custom tags module exists, but it doesn't
quite tell me how to make a custom tag to jump to another typo page.  I mean
i could <a href="index?id=<pageid>"> would be fine.  But it won't translate
that into the RealURLs i'm using, and i'm pretty sure someone might mention
the 'pagelink' content, thing i want a tag to linked to it out of text
content or html content.