Creating a Phone App Shortcut for Remote Computer Shutdown via Bluetooth

Hello, I decided to make a phone program to use it to control the computer (via bluetooth). Everything would be fine if it wasn't for one problem, namely I want to assign the phone key the appropriate shortcut (key combinations on the keyboard) that would turn off the computer. If someone knows such an abbreviation, I am asking for help Win + L is out, alt + f4 is also out because at most it closes the applications on the computer but will not shut down the system. I know you can make a shortcut on the desktop and assign it the properties "shutdown -s ..." and then assign a key combination to that shortcut, but it would be impractical if someone else used this program on their computer. So I am asking for a hint,
if anyone wants, I can send this program to him when it is ready.

System Windows XP.

I'm not sure if I understood correctly, but almost every keyboard is equipped with a Power button to turn off the computer, and almost every bios to operate this key.

I press Win K W. Just not to be confused with Win + K ...

Method 1
Go to the WindowsSystem32 folder and search for shutdown.exe. Make it a desktop shortcut, place it on the quick launch bar and you're done - one click and the computer shuts down.
The same should be done if you want to log off from the system with one click - make a shortcut to logoff.exe in WindowsSystem32.
Way 2
Instead of an icon, you can use any key or combination of keys. For example, you want to turn off your computer with
CTRL + F1 keys - execute:
1.Right click on the desktop and select NEW-> SHORTCUT
2. in the "enter location" window enter: shutdown -s -t 0 (options: -s turns off the computer, but by replacing it with -r you will restart the computer, and -t means the time of the command execution - in this case immediately, because you entered 0, but you can enter any number that will represent the delay in seconds to time
performing the steps)
3.Click "next" and "finish"
4. shortly click the right mouse button and select "properties"
5. on the tab
"shortcut" find "shortcut key" and enter CTRL + F1
6. confirm the changes made

By pressing CTRL + F1 the computer will turn off. If you want a shortcut to restart, do the same thing with shutdown -r -t 0 as the command and assign it a different key combination.

These are basically the only methods ... there are other but difficult to do because you have to play around with the power options ...