RDP login method?

Hi

This isn't an issue with RDM or anything but, I was just wondering if you could tell me what method is used to login with the user's credentials when logging into a RDP session?

i.e when I fill in my user name and password in the settings (see screenshot), and then open the connection to it's machine via RDP; RDM auto-fills in the credentials and logs the user in (works great!).



I'm wondering because I'm trying to write a vbs script (or similar) to do the same via the machine's Task Manager, but having no luck.

I just want to script a login using my credentials, than after X amount of time, lock the machine. I've tried googling and trying various claimed methods but no luck, and remembered how great RDM does it, so was hoping to find out how so that I could maybe to the same with my own script.

Any help greatly appreciated!