To dial a modem or VPN connection from the command line or batch file in Windows XP/2003:
Use RasDial.exe from the C:\WINDOWS\System32 directory
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rasdial.exe {Connection Name} [username] [password]
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Used to Connect.
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Username and Password are optional.
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rasdial.exe {Connection Name} /DISCONNECT
NOTE: Remove the curley brackets "{ }" from the above commands.