< :the previous in number
^ :the list in numerical order
> :the next in number
P :the previous aricle (the previous thread)
N :the next article (the next thread)
|<:the previous thread
>|:the next thread
^ :the parent (reply-to)
_:the child (an article replying to this)
>:the elder article having the same parent
<:the youger article having the same parent
---:split window and show thread lists
| :split window (vertically) and show thread lists
~ :close the thread frame
.:the index
..:the index of indices