keyCulator is the simplest calculator software in the world. However, the simplicity is both a concept and a power! This is the only calculator software without a program window. Actually, there is no window at all! But how can it work? The answer is simple: keyCulators add calculation functionality to ANY RUNNING PROGRAM. Imagine you are typing "1+3" in a Notepad or MS Word document and hitting "=". keyCulator will paste the result right into the document and you'll get "1+2=3". If you need only the result, just press "=" once again and keyCulator will replace all the characters typed by "3", the result. If you do not need the result in your document, but just need to know it, simply press "Esc" and the result will be removed from document.