chris actually wrote an nio version of the code, but because limewire has to support users who don't have java 1.4, it needs some hoops... the nio version, instead of using 2 threads per connection, uses 1 master thread [in a nutshell -- it is more complex]. but the nio framework java provides is fairly buggy... in all, nio will probably make it into release code sometime far in the future.

i don't see how nio & security relate tho.