Ok so I am shopping for a printer or an all-in-one. But I need help understanding some things ... Ok first of all, I know (I think) the basics of what laser and inkjet is, but what is dot matrix?? Person in a store told me that laser printers last like 2x as long as inkjet ones and also that for the same amount of printing, inkjet cartriges will cost more than laser. And also if I'm buying an inkjet, it's probably better to have a printer that uses separate cartriges for each color as opposed to one for all because then u won't end up with replacing an entire cartrige when only one color is out. That's as much as I know about laser/inkjet. Is this all correct by the way? Anyway, if these are the cons/pros of inkjet and laser, what are the cons/pros of dot matrix? And like I said above, what is it? ** Secondly, I was looking at this printer here: refurbished printer on newegg and same printer on manufacturer's site here On the newegg description, if u scroll down to the "Ports" heading, it says network ports is optional. ??? Wth does that mean? I go to the other site, the lexmark site itself, and in the q & a section it says it's networkable with an optional network adapter (u can see that in the 2nd link above). So let me get this straight. Is it saying that I can buy a network adapter and insert it into the printer itself?? I mean, I thought printers either have built-in networking (in which case u simply plug an ethernet cable from your router into it) or u have to buy an external print server if u want it networked. So what are they saying there? How is what they're saying different from those 2 alternatives?