Thanks for your reply to my post.
The document you refered me to was quite helpful. The more I work on sharing my HPDJ712C, the better I get a networking as a whole. However, I am a neophyte at best.
After following the instructions on Paul Barker's post, this is where I stand: The printer will load a page and prepare to print (from PC#3). When the printer goes into the actual print mode, I receive an Win error message on PC#1. The error message refers to "Hpfp13.exe". At this point, my document will not print. When I try to print from PC#1 (the "host"), I receive an HP error message telling me the printer is busy. I must restart PC#1 in order to print again.
Oh well, at least I got the printer to load a page!
My next step is to try and get a hold of Paul Barker and see if he'll let me pick his brian!
I'll let you know when I resolve this issue.