Setting a computer to automatically switch on at a specific time can be achieved through BIOS settings that support this feature. Additionally, users can create a batch file to schedule shutdowns using "Scheduled Tasks," which can also wake the computer to run the task. For remote wake-up capabilities, "Wake on LAN" technology allows a network interface card (NIC) to listen for a wake-up signal over the network. This method is commonly used in environments like schools for updating multiple computers overnight. Auto-shutdown software is also available, but the focus remains on BIOS settings and Wake on LAN for automatic power-on functionality.