How to specify a printer?

Question

I have a coldfusion application that's used by a collection of users who are all using the same type of label printer.
One thing the app does is use cfdocument to generate a pdf sized for this label printer.  It also generates a series of forms that are printed on a regular printer - these vary, and are the default printer on each client's machine.
Here's what I need to know - when the label is generated, they press the print button and the print dialogue opens, how can I make the label printer (not the default printer) the printer that's selected?  So all users have to do is click "print" --> "ok" and the page prints, without needing to choose a printer.
Like I said, I know the exact printer all my users are using.
I know this can be done as one of my users sent me screen capture of another web app doing this.  I didn't catch which scripting language they were using but will try to find out.
So, obviously this is possible with some combination of web scripting / javascript / vbscript / something.  Can anyone offer ANY ideas?  I don't even mind if it's a browser-specific solution in this case.
Thanks much,
Joe

Answer 1

Thanks Tclaremont for the link.
I did look at cfprint and getprinters.  Thing is, I keep reading (in your link too) that they're for server-side printing only.  That's the opposite of what I'm trying to do.  My users are a series of independent businesses strung across the U.S., who all happen to perform the same function and therefore all use the same specialized printer type to do it.  They are all using the same TYPE of printer, but every business has their own, in their own building.  These places are definitely NOT on a network as many of them are competitors.
I don't need to determine the types of printers available on each client's network.  I KNOW which printer I want to specifiy, and I know they all use it.  I just need a way to specify that printer - instead of the default printer, which is usually an office laser printer / copier / fax - in the print page dialogue that I'll probably open with javascript.  I'm trying to avoid forcing the users to select the specialty printer instead of the default every time they print from my system.  It's not a real big deal but you know how that goes: people get in a hurry and you've got print jobs going to the wrong printer, wasting paper, toner, and time.
I've read this isn't possible, but like I said, I've seen another web app that does it.  It's definitely possible that they've "tactfully" installed something on the user's computers to do this, and I'll stop short of that.  But if there's ANY combination of web-based scripting languages that can do it, I'd love to learn.
Thanks...
Joe