How to anonymously connect to a VPN from your app?

Question

VPN

Hello! Help me decide where to dig.
Available:
1) PPTP VPN server
2) SSTP VPN server
3) Desire to write an application in DELPHI.
Needed:
SSTP or PPTP VPN client [which is easier and faster to implement] Win7/8/10 working bypassing the address book %USER%\Application Data\Microsoft\Network\Connections\Pbk\rasphone.pbk so as not to burn the address and connection settings to the server, store connection settings in the bowels of a self-written application.
I do not quite understand whether it is possible, and how to do it on the RAS API?
I would be very grateful for a code example or some simpler solution to this issue.