Allan, what's with the self-quoted "No"? I really hate being contradicted so flatly. Maybe I didn't make myself clear enough. On dual-boot or multi-boot system running multiple instances of Windows operating systems on different hard disk drives (partition or volume), by default there will be multiple instances of pagefile.sys created. In order to avoid wastage of disk space , it is definitely possible for the multiple OSs to all use the same location for their paging file. But not simultaneously. (Obviously.) I suppose, since the content will change depending on which OS is running, and since a paging file dies when its OS shuts down, it might be more rational to speak of them as different files with the same name and location.
Method: boot each OS in turn, go to system properties, and in the virtual memory settings, deselect “Automatically manage paging file size for all drives” and manipulate the page file options so that only the required common page file partition contains a page file, and set minimum and maximum page file size appropriately.