Problem:
I have many documents that I would like to convert to a single PDF file without being prompted to merge for each file.

Solution:
If you download and install the "Win2PDF Admin Utility", you can enable an option to automatically name and merge the PDF file without prompting. You can download the "Win2PDF Admin Utility" from the download section of the Win2PDF support web site:

http://helpdesk.win2pdf.com/index.php?/Knowledgebase/Article/View/187/15/win2pdf-admin-utility-download

Once installed, you can click on the "File Name" tab and type the full path to the file name. For example, if you want to place the PDF files in a folder named "PDF Files" on your "C:" drive, you would type the following in the Admin Utility:

c:\PDF Files\plot.pdf

Change the merge section of this dialog to "Prepend the following PDF file after creation" and set the text box below this item to the same file name and path as the PDF file name. This will automatically add new PDF documents to the end of the existing document. Check the "Always use these settings" check box and click "Apply".

You will have to run the Win2PDF Admin Utility again and remove the file name when you want to create PDF files interactively.