DoneEx introduced a custom formula calculation engine . Instead of just hiding cells, the compiler converted Excel formulas into binary code . When a user ran the resulting EXE, the original formulas were no longer there to be found—the software calculated the results internally and simply "reflected" them back onto the spreadsheet interface.
DoneEx XCell Compiler 2.0 is a software tool designed to protect and compile Excel VBA (Visual Basic for Applications) projects into executable files (.exe) that can be run on any Windows machine without requiring Microsoft Excel to be installed.