A couple basic questions about GUID

[MrKrinkle]

So ok I read the wikipedia page about GUID, and here's som ethings I don't get-

 

1. So MacOS prefers to be installed on a drive that's partitioned with GUID, right? So I'm beffer off if I use it when I install. (I'm going to try the boot-132 method since it seems to be popular now).

 

2. If I currently have a drive with normal MBR partitions on it, do I have to repartition the entire drive when I install MacOS? Or can, like, one partition be MBR and another be GUID on the same drive or something?

 

3. Can windows (xp 32) see GUID partitions?

 

I bet these are stupid questions- I've read a lot of stuff but I still don't get it sorry!