Using separate interconnect connections at same time on same PC

[nsdataone]

I am having 2 ADSL connections for my internet. One main connection is say A (192.168.1.1) and other connection is say B (192.168.1.2). Both these modems are connected to Switch. My PC is connected to Switch. All IPs are static, no DHCP. Both A and B internets are available to my PC. I keep both modems on all the time and when I need to switch from A to B on my PC, I simply change the gateway and DNS in my local area network setting in PC. I use NetSetMan freeware to keep on switching between 2 internets (NetSetMan changes the IP and DNS and Gateway quickly with shortcuts).

I am looking to use both connections A and B for separate softwares at same time. e.g. I want to use connection B for my MSN and Yahoo messengers and at the same time I want to use connection A for my other internet use. Any way or software for such thing?

[Termin@L]

cant b done coz wen u use one connection say A thn the OS utilizes the internet ports for tht connection.
If now u start second connection it sez tht the port is busy...
Try using virtual OS....dunno if it helps...nvr tried...