ProKalc is a full-featured scientific/financial calculator with scrolling tape. Using a point-and-click interface, you enter data for trig, exponential, scientific, and amortization problems and get immediate answers, with your input reviewable on tape. You can print results to the Clipboard, a file, or a printer. Ten memory locations, online context-sensitive help, pop-up work screens for complex calculations, and 15-digit accuracy without rounding errors make it a winner.