Cambodia Re-Entry On Business Visa?

I've been researching getting a 1-year extension to my Cambodian visa (it's a plain visa, not a tourist visa, which makes it a business visa, right?). I haven't seen anything on any of the websites to convince me these are multiple-entry, other than an off-hand 'yes.' If so, is there a limit to the re-entries, and how do the notorious land borders treat you when you show up to come back into the country from Thailand?

thanks