Is there a way to enable the "Run Steam when my computer starts" option without any window to appear when I login?
This way Steam will start running as an icon in the system tray in the bottom right, ensuring that everything is up-to-date, but it won't bother me if I don't want to use it/play a game immediately.
Best Answer
You can use Steam launch options, which can be used to change game settings and enable features.
For example one of these launch options is:
-silent : Launches Steam to the system tray only. Normal Steam windows will only appear after clicking the system tray icon. If a password is not stored, the normal login window will still be displayed.
More info about Launch options here.