This dll doesnt have an entry point so its not necessary to register it. Only copying into the system32-directory or in the directory where your application is installed. If youre using vba (from ms access or excel for example) you should declare the functions as private and not public. Using .NET-environments (like MS Visual Studio) its often better (to avoid stack imbalance errors) to change the parameter-types from longinteger to integer.All functions from the full version are in the shareware-version, too. When a value will be returned by the dll first a window with a shareware note opens - when you click on "OK" you get the value. So you can test the quality of all functions. This messages dont pop up in the full version! If youve already build applications with the dlls out of the shareware version dont through them away - if you buy the full version you only have to replace the dlls (de-/register).