[XeTeX] Vertically writing of Japanese in XeLaTeX

[Gerrit Sangel]

Hello,

I just wanted to ask how I can typeset an Asian text (in my case Japanese) 
vertically? I saw this in one example pdf, but I didn’t see the .tex file. 
Either way, I think it was done in TeX directly, but I want to use LaTeX.

Is there a command for it? Like \vertically or something like that? ;)

And can I include it in a minipage or so, so I won’t set the entire document 
vertically?

Thanks
Gerrit