PDF stands for Portable Document Format and it was created by Adobe to ease document exchange. doPDF is a free PDF creator that does what the name suggests, creates PDF files. Once installed it will allow you to convert any type of printable documents to PDF files. doPDF installs itself as a virtual PDF printer driver so after a successful installation will appear in your Printers and Faxes list and also in the list of All Programs. Using doPDF you can convert to PDF in two ways:
Print to PDF via the virtual printer driver doPDF.
You would do this exactly as you print to a regular printer, just the result will be a PDF file, not a printed piece of paper.
Using the doPDF Startup window.
doPDF has an executable file (accessible from the start program group) that you can run in order to start a conversion wizard.