The page to which you linked reads fine to me. What is it explicitly that you are looking for which isn't covered?
Update: There's a new issue for this very topic.
In reply to Re^4: Where is documentation for defining servers for use by Rex?
by hippo
in thread Where is documenation for defining servers for use by Rex?
by nysus
| For: | Use: | ||
| & | & | ||
| < | < | ||
| > | > | ||
| [ | [ | ||
| ] | ] |