Build simple windows service in Delphi

I need build a simple windows service to run on a windows terminal server with multiple user. The service need to startup/run [login to view URL] for each user session when the user log into the terminal server. 1) Source code written in Delphi XE7 or above without any external DLL's. 2) Target OS: Windows 7, 8, 10, and windows terminal server 2016. 3) Service run as a LocalSystem account.