yup android and windows.Dual boot android and windows?
http://forum.xda-developers.com/showthread.php?t=623792 <<
Unless you're trying to dual boot window roms, then no. If you want to run different versions of android on the same SD card, then just put "rel_path=(directory, such as a folder named "android" with all the XDandroid files in it)" in the "cmdline"