1. Go to Project/Properties/Make
2. Change the Title to: "SCRNSAVE: screen saver title"
3. File / Make Project1.exe but when you make it, just change .exe to .scr
4. Explore the options by displaying COMMAND$ as Windows sends switches to your .SCR (renamed from .EXE). I don't recall them off the top of my head, I think that windows more or less send "/C" for the "Settings" applet, sends "/P" for preview mode, and there is one other one and the /C may be incorrect, but thats how you do it.

When your done copy it to Windows\System or Winnt\System32 and it should show up in your Display Properties / Screen Saver tab!