The RLM Software's hp41c Ultimate calculator simulation has all the functions and capabilities of the real calculators, plus the following extended features : 1000 memory registers. 1000 program steps per program. Unlimited quantity of programs in memory Variable view size. Global Floating Window option No frame window option. Paper tape output. Register's content view tool. Preferences menu to set the main settings. Dynamic keyboard according calculator's state. Program, Overlays and Modules easy selection. Program editor with description, instructions and line comments Overlay editor for customer's key assignments. Application Modules editor and builder. Sound and spoken feedback settings. Save and Load programs, overlays and modules Save and Load memory sets.