OK 2 questions

whats the difference between Adobe Photoshop CS2 and Adobe ImageReady CS2

Second question is in the liquify mode theres a check box that says "Stylus pressure" Im assuming that this is for your touchpad?? How can i use this?? I have a touchpad but it wont let me check the box.
OtterPop Reviewed by OtterPop on . Photoshop Users ( and viewers ) Lets start a graphic contest, im FAWKIN BORED 600 x 250 something to do with cannabis, dont steal ppls shit plz. <3 Rating: 5