Okay...but I still don't understand something. If the system currently wants a document (JPEG) of a particular width, however that width is calculated, how does the PDF become the same width?
e.g. If the JPEG had to be 5,280 units wide (call them feet) but the PDF was a single measurement (say a mile wide), it's still the same physical width. Are there such equivalents in the world of raster and vector graphics, or does the CMS need to be able to adjust the PDF to fit the available space?
Joemikeb has it right--the vector PDF that you get out of Word can be scaled to fit any size you like, from postage stamp to billboard.
A PDF does have a "print size" associated with it; if you make a PDF from a Word file that's set to 8.5x11" paper, the PDF will print at 8.5x11" unless you specify otherwise. However, this has no bearing on a pixel dimension, or on how a Web browser shows it. A Web browser will display it on a computer screen at whatever size the browser is instructed to.
