You can certainly use the shortcut control, as in Rick's
instructions. I give another method here, the difference is that
the parser function will open the .pdf file in the help browser
window, while the shortcut control will open it in a new window.
Another way is to use the parser function provided by
Microsoft for this purpose. I've attached the code you would put in
your <HEAD> section. Then call with
ONCLICK="parser('yourfile.pdf')"
to address your question, I'm never sure when the compiler
adds files to the compiled help. But if you remove the .pdfs from
your project folder before compilation, they won't be included.
Sometimes the compiler throws in the files if it finds a link to
them, even if you intend the link to be external.
John