The pin diagram should be on the drive itself, as it varies from drive to drive

As for Dual-Boot, WinXP itself should detect the presence of WinME, and create it's own dual-boot menu if you install it on a drive other than WinME's. I myself use BootMagic though (from Partition Magic), since I used to have a triple boot with WinXP/98/Linux and didn't want to use the Linux boot menu at the time (I no longer have Linux installed now anyway)