choose specific network connection for interent access

hi,
i have several network cards, each with its own internet access.
is there a simple way to switch between them?
currently i have to disable the "primary" one to access thru another.

I'm not exactly sure what you are trying to do but if you go to your IPv4 properties you can use the alternate configuration to add different Ip's, DNS servers and so on.
You can also use the advanced tab to enter the TCP/IP info for more than one connection.