easily, be implemented with the Windows WYSIWYG screen and mouse. For example, "go down four lines" has a clear meaning on a DOS screen, but no definite meaning with a Windows screen. WordPerfect lacked a way to meaningfully record mouse movements. A new and even more powerful interpreted token-based macro recording and scripting language came with both DOS and Windows 6.0 versions, and that became the basis of the language named PerfectScript in later versions. PerfectScript has remained the mainstay scripting language for WordPerfect users ever since. It dealt with functions rather than with keystrokes. There was no way to import DOS macros, and users who had created extensive macro libraries were forced to continue using WordPerfect 5.1, or to rewrite all the macros from scratch using the new programming language. An important property of WordPerfect macros is that they are not embedded in a document. As a result, WordPerfect is not prone to macro viruses or malware, unlike MS Word. Despite the term "macro", the language has hundreds of commands and functions and in fact creates full-fledged programs resident on and executed on the user's computer. In WPDOS 6 the source code is generated using the same interface used to edit documents. A WordPerfect macro can create or modify a document or perform tasks like displaying results of a calculation such as taking a date input, adding a specific number of days and displaying the new date in a dialog box. Documents created or edited by a WordPerfect macro are no different from those produced by manual input; the macros simply improve efficiency or automate repetitive tasks and also enabled creating content-rich document types, which would hardly be feasible manually. The PerfectScript macro language shows especial versatility in its ability to deploy every function that exists in the entire office suite, no matter whether that function was designed for WordPerfect, Quattro Pro or Presentations. The macro development wizard presents and explains all of these functions. The number of functions available through PerfectScript is unparalleled in the office market. On top of the functions available in the main components of the office suite, PerfectScript also provides the user with tools to build dialogs and forms. Widgets like buttons, input fields, drop-down lists and labels are easily combined to build user-friendly interfaces for custom office applications. An example: a Dutch housing company (VZOS, Den Haag, several thousands of apartments) had its