In fact, ALT+C just depends on the player's current operation.
First, you have to choose the player's perspective (non-ob perspective), and then press CTRL+C all the time.
In this way, the center of the screen is constantly switched to the unit selected by the player, so that you can watch the real-time operation of the player, which is similar to the effect of the first perspective, but people who are not suitable will feel dizzy. If the player's apm is higher than the speed you press, then I advise you to look at the first angle of view, and your eyes will not stand it. What is unexpected cannot be operated, so it is impossible to find anything.