HP15c is a simple emulation of the legendary HP 15 C Calculator from Hewlett Packard on the Desktop. The input of  UPN-Logic calculations are faster than the conventional way with the equals sign ( see  Wikipedia).

It is possible to operate the calculator with the mouse and the numerical keypad. It can be moved free on the desktop. With turning the mouse wheel the size of the calculator can be changed. All function can be controlled by the keyboard. The white characters close to function key shows the key to be pressed.

The complex operations and the matrix operations are not yet implemented. Also it is not possible to program the calculator..............................

The free version has no restrictions, so you can test the version before buying. The "About" Message will not been shown anymore with a registrated version.