Well...
For Process Wee Codes you could link to [link|http://z.iwethey.org/forums/render/content/show?contentid=57396|http://z.iwethey.org...w?contentid=57396].
Auto conversion is self-explanatory. As is converting newlines to BR tags.
The HTML processing isn't entirely, but in the case that I gave the distracted user would likely try turing it off, so not having that explanation might be OK.
Cheers,
Ben
"Career politicians are inherently untrustworthy; if it spends its life buzzing around the outhouse, it\ufffds probably a fly."
- [link|http://www.nationalinterest.org/issues/58/Mead.html|Walter Mead]