SSO between SUS and SRM

dear experts,

i need your help because we are trying to configure the following scenario:

we have in the same system, two clients. One client is SUS and one client is SRM. Our need is to logon on the SUS web part (service srmsus) and once we are logged on SUS jump to MWBC on SRM without specify the user and pass, and the user that we use to logon on SUS is diferent that the user mapped on the SRM.

is this possible? do you have any information about this?

we only have this system, we have no portal anywhere.

thanks a million in advance

best regards

david