Previously, it beta'd as "Comodo Memory Guardian".

Downsides are some negative interactions with some programs, even things like .Net framework and compiler.

Upside is greater buffer overflow and similar memory hack protection than DEP (though if you have DEP available, you should also be using that in "optout" mode, and thinking carefully before granting an optout to a program that has not previously required one, as it may be subject to an attempted compromise.

the standard firewall blocks stuff moving in or out on your internet connection.

this is supposed to keep blocks of data stored in memory areas that programs don't run in- but programs do use to keep track of things- from getting stuffed too full and spilling into other unrelated blocks.

vastly different, but attackers try to make your browser lose track and get the blocks to step on each other- this is supposed to stop it. wish it'd run on win2k.

http://www.memoryfirewall.comodo.com/

this one is free, and i already use their comodo firewall, and so far, i am happy with it, but i have read over and over again over this memory firewall, and still dont understand clearly, whether one need that or not?

can anyone explain in easier words, when such a separate firewall would be needed?