 
  NEW YORK (AP) -- As if junk e-mail and pop-up ads weren't annoying enough on their own, now there's pop-up junk e-mail. 
A developer of bulk-mail software has figured out how to blast computers with pop-up spam over the Internet through a messaging function on many Windows operating systems. 
The pop-up messages appear on recipients' computers in separate windows, similar to pop-up ads that appear when a user goes to a Web site. 
But there's a difference: Anyone can send the messages, and there's no need for the user to have an Internet browser open. 
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