About Tripcodes...

The FAQ here is a little vague on some points:
FAQ says short word.  Must it be a word or can it be a random string?
Max length?
Case sensitive?
Forbidden characters? (I assume # is one)
Link to more in depth info?

Thanks in advance
les

I'm guessing that shiiboard tripcodes are compatible with futaba tripcodes? In which case...
Max length: 8 characters
Case sensitive: yes
Allowed characters: [a-zA-Z0-9] <space> .!:#/`()_$[]+*{}-
If the tripcode is 1 char in length, it has "H" concatenated to it.