These boxes allow for different Remote Addresses so you can have multiple boxes without confliction. Not sure how you change your second one but it will be in the manual or on the Net somewhere. As far as the M1 is concerned. all Dish boxes use the same codes so have a look in the kist and see if you can see one that has the alternative address. If you can;t find one come back and I will build you a Custom Remote.
Don't understand Q2