Short description of DreamCalc DCP Professional Calculator 4.5.0: DreamCalc is a Scientific, Graphing & Financial Calculator for Windows. Unlike the standard Windows calculator, DreamCalc gives you an intuitive and almost tactile experience. It's like using a real hand-held on your PC, laptop or tablet computer! Select from Reverse Polish Notation or two styles of algebraic input, and with the optional ability to run in your system tray--DreamCalc will always be there whenever you reach for a calculator.