I only have one microwave in my kitchen. Can I use it for both meat and dairy?

In my apartment, I only have one microwave. Can  I use it for both dairy and meat? If you can,   it's obviously best to have separate microwaves  for meat and for dairy. But if one doesn't have   the room for it or one can't afford  so, one can use the same microwave,   but it should be done the following way.  You should designate it as the primary use,   either meat or dairy. Choose one. Let's say  I mostly cook dairy in my microwave, so I'm   going to designate it as a dairy microwave. And  then if I ever need to cook any meat, I'm going   to double wrap that item so that it won't steam up  the rest of the microwave. So what I do is I put,   let's say, Saran Wrap, around my bowl and then I  put it into a paper bag, and that way it has two   coverings around it and even though I put it into  a dairy microwave, it will not affect it. Now what   happens if I cook it a little bit too long and  the bag pops, and the chicken soup goes flying   everywhere? Then you have a real question, and  you should go call your rabbi, ask him what you   should do, how to kasher the microwave. Those are  all issues that would then have to be dealt with.