I give it a try. All of the following I have learned some place here in this group (or even copied from there), but you are right, LaMarca, the information should be at one place. Here it is (and I'm curious whether I get it all correct):

1. Hard break: type <BR>
(it looks nicer for you if you also use the usual Return key after that combination, but you do not have to)

2. Indent part of a message:
<UL> at the start of the chorus
<LI> at each line of the chorus
</UL> at the end of the chorus.

3. Put a link to another website:

type <a href=URL-Adress-of-the-Website>any-name-you-like-to-call-it</a>

(Example: if the URL-Adress-of-the-website is http://www.summerfolk.org/srmain.htm and my choice for any-name-you-like-to-call-it is The Stan Rogers Page and I type it as described above then you can click from here The Stan Rogers Page.

4. Include HTML characters like the right and left arrow brackets in a message so one can illustrate the command without actually executing it.

(What comes now is new for me; good check whether I have understood that message)

&lt gives you the <
&gt gives you >

Thanks to all those who have explained it before me and made possible this compilation.

Wolfgang