A simple 'pocket' calculator with all the basic and some advanced functions, and that uses very little space in your desktop. Has copy/paste, can show a right hand 'paper strip' where all calculations are show the 'old fashioned way' and saved to disk for later consultation. To access the menu just right click mouse over it. Has some more advanced and scientific functions that can be shown from that menu, bottom line is that this might well be the smallest, non-obtrusive calculator still around.