Buffer overflow?

[walt]

Matthew Dillon wrote:

 .
 .
 .
    The key is to make this all doable in userland.  Restricting
    these sorts of features to the kernel greatly reduces the
    number of people who can potentially develop code up 
    related projects.
Sorry, Matt, I can't quite parse that last sentence and it seems too
important to let it slide.  Could you rephrase and amplify a bit?
And thanks for your earlier answer, it helped.