CalcSupreme
CalcSupreme, an RPN calculator emulation and much more, encompasses a wide range of fundamental and sophisticated basic, financial, math/science, and logic operations, accessible respectively via 4 different screens. Basic operations include arithmetic, algebraic functions, data manipulations,... In addition to planned upgrades of certain existing functions, new functions and tasks will be added as dynamic link libraries (DLLs). ... Program uses multiple resources of PC and PC software, incl pull-down menus, message/dialog screens, file/list boxes, disk drive(s) and data/user files,...
http://www.syringasoftware.com/download/CalcS_inst.exe - 5Mb - Download - Screenshot