CutePDF Writer, once installed, creates a new virtual printer on the system. And all the files that we send to that printer will be automatically converted to PDF, and stored where we tell it to store them. Thus, any file that we edit with Word, for example, can be stored as a PDF, allowing us to send it without danger of anyone editing it.
To tell the truth, the program is completely transparent to the user. It doesn't even have a shortcut in the start menu, we'll only be able to access a Readme. But when we select the printer created by CutePDF Writer we'll obtain the results almost instantly.