As computers go these days, it is not unusual for the amount of free RAM to reach a critical level at which no other processes will fit into what little unused memory is left. Modern operating systems will then start swapping pages of memory to disk to make room; the data can be read back in later if necessary. This is a procedure called swapping, and it can take several forms. Windows maintains a large hidden file somewhere on the drive (usually in the root directory of C:) which it uses for this purpose. Linux, UNIX, and UNIX-alikes most often …