Ok, I just downloaded the THINK software, and installed it on my four systems...
2.2GHz 1GB 3200DDR RAM, 120GB HD
1.8GHz 512 2700DDR RAM, 30GB HD
1.1GHz 512 2700DDR RAM, 60GB HD
900MHz 256 2100 SDRAM 30GB HD
I am the only computer user in the house and am only ever using one system at a time (

). The others are just up and running idle on a wireless network, thru a router and cable modem.
Are the above specs considered a good offering, or should I add more ram somewhere or something?
I configured all for the same projuect # and same email address, so I guess that it will use all the idle time as one unit instead of four individual machines?
One machine has a little THINK box with a pic of a molacule and a bunch of numbers... the other three are just a white box with a black telephone moving around. Is this normal? Or do I need to change some configs?
Thanks to anyone who takes time to reply.

KarenMarie