RDP Dual monitoring on terminal server 2003

Hi, I am running windows 7 client pc with dual monitor. Our server is 2003 terminal server and we want to use dual monitor while connected to the server. I went to some articles and done the following on the client computer:

1. run mstsc /span
2. in RDP properties> allow all monitors
3. use multimon: 1 in rdp file

All these did not work so I am seeking for help to resolve this.

Thanks
Brij Mohan