Howdy Bist and welcome to the forums!

lineage 2 could be one of those games that requires focus in order to process input. Lavishsoft's innerspace will allow you to 'lock' the game in the foreground, and then be able to pass keys normally. if you had 1 per machine, it would work fine... but as soon as you want more then 1 per box, then innerspace will be needed.

if you have any other questions, please feel free to drop me a PM

have a great night,

Rob