Apperently foudry is a sinc between hammer and the engine for pulling up entities for editing. Alien Swarm SDK has much of the needed part excluding foundry.dll which is required to get into foundry mode.
Foundary cannot fucntion without a special version of hammer with the foundry options
Ingame commands are
--Kwp17pitts 20:24, 1 January 2012 (PST)