How to set up a vpn under Linux to a Windows server if a shared key is set for the vpn?

Question

VPN

Tell me how, under linux, you can connect to a windows server via vpn if the vpn has a shared key.
Under windows 7 connection to vpn happens without errors.
The openSUSE 12.3 distribution was trying to set up a connection using the NetworkManager applet in kde.
When adding a new connection, I chose the vpnc option, in the gateway I specify the server address, I specify the shared key in the "Group password" field.
It is not clear what to specify in the "Group name" field, I tried to specify the username, but it does not work, adding vpn under windows 7 does not require this parameter.
The screenshot shows the NetworkManager configuration window.