Monitoring usage of two different ISPs on the same PC

I have one ISP to which I connect via the Ethernet card and an ADSL modem.
Netmeter does a good job of showing the upload & download speeds, and the upload & download usage.
I am planning to use a usb dongle from another ISP, on the same PC.
Is there any way I can monitor their usage separately?

Regarding the issue of monitoring two different ISPs, rather than experiment, I've taken the easy way out.

While a single instance of Networx does provide statistics for the two different ISPs, I do not know whether it can provide all the usage stats separately for both ISPs.

I have gone for two instances of monitoring software.

For both ISPs, I have to use "All Dial-Up Connections", so I can't have both instances of Networx/Netmeter running at the same time.

Each portable version must be kept in a separate folder and fired up before connecting to the internet.

Another method is to use two different monitoring softwares, but again only one should be running at a time.