RD Webaccess pass through authentication

Hi there,

i have the following problem / scenario:

1 RD Gateway Server in a DMZ with Webaccess
1 RD TS Server in a training domain where i host some applications

I try to set up the environment with SSO pass through, but i have no idea if this could work.

This environment is for training purpose, so the customers have to logon to the Web Access site with the domain account i gave them (Stud1 for example).
After the first login to the Webaccess Site i see my provided applications. 
If i start then the app (mstsc), i have to enter my credentials once again.

Is it possible to set up my environment in the way i do not have to enter my credentials twice?

Thanks in advance.

Emanuel