The Handbook
is a calculator for your desktop environment. In the simple mode it can be used for basic arithmetic operations, but provides advanced modes for scientific, statistical and numeral system calculations.

Introduction
offers many more mathematical functions than meet the eye on a first glance. Please study the section on keyboard accelerators and modes in this handbook to learn more about the many functions available.
In addition to the usual functionality offered by most scientific calculators, offers a number of features, which I think are worthwhile pointing out:
provides trigonometric functions, logic operations, and it is able to do statistical calculations.
allows you to cut and paste numbers from/into its display.
features a results-stack which lets you conveniently recall previous results.
You can configure 's display colors and font.
You can configure 's precision, the number of displayed digits and the number of digits after the period in the settings dialog.
offers a great number of useful key-bindings, which make using without using a pointing device easy.
Hint: pressing (and holding) the -key, displays on every button,the corresponding key-binding.
uses Infix notation which enforces correct order of operations as taught in school; contrary to Immediate execution used by many simple calculators.
Have fun with !