What does "message capability" mean? (as used in tiger report)
 

I have run tiger on my etch system, and gone through the results.
I have been able to sort all the messages into resolved/wontfix/understoodbutnosolutionyet.
However, there is one message tiger gave me where I have no idea what it is even talking about:

# Performing common access checks for root (in /etc/default/login, /securetty, and /etc/ttytab...
--WARN-- [root003w] Root user has message capability turned on.

tigexp root003w:
The root user should not have the message capability turned on.
This could lead to inadvertent modification of files with the root user
is logged in.

Of course I tried googling for it, but could not find anything relevant. Can anybody enlighten me?

EDIT: Should be in Linux-Security, only spotted it afterwards...

AFAIK "message capability" here is 'man 1 mesg'. Add '(/path/to/)mesg n' to your /root/.bashrc.