Which model is this keyboard ?
Look on the underside of the keyboard, there should be a little silver like plaque that has the make, model and serial number of the device.
If I push this "pause/break" button on my keyboard, will my keyboard become dormant ?
Nope.When your computer is booting up during POST if you push the button it will basically pause the system.
GE Model 96 Hand Held Vacuum Cleaner -What year was this model produced and how much might it be worth?
Of course not until yo plug it in and connected it to a drain line
Can i use a dell keyboard model sk-8135 with windows 7?
Yes. Windows will work with any standard USB keyboard (the Dell model you mentioned included).