DUN (Dialup Networking).
Microsoft’s term for the software in Windows 95 that attaches a
PC (Personal Computer) to the Internet via a dial
up SLIP (Serial Line Interface Protocol) or
PPP (Point-to-Point Protocol) link. By default, the Windows dialer behaves
idiotically spawning either none, or duplicate copies of itself which interfere with
each other and disconnect the session. There are three solutions,