Microsoft Windows -- Prevent Screen Locking by Inactivity Timeouts

Problem

You want to prevent Windows to lock screen locally by inactivity timeouts, like pretending being online and 'alive'

Solution

Use below Python script which simulates dummy mouse moves to pretend online and alive on the system:

import ctypes
from   ctypes.wintypes import DWORD, LONG, WORD
import time

ULONG_PTR = ctypes.POINTER(DWORD)
INPUT_MOUSE = 0
MOUSEEVENTF_MOVE = 0x0001

class MOUSEINPUT(ctypes.Structure):
    _fields_ = (('dx', LONG),
                ('dy', LONG),
                ('mouseData', DWORD),
                ('dwFlags', DWORD),
                ('time', DWORD),
                ('dwExtraInfo', ULONG_PTR))

class _INPUTunion(ctypes.Union):
    _fields_ = (('mi', MOUSEINPUT),)

class INPUT(ctypes.Structure):
    _fields_ = (('type', DWORD),
                ('union', _INPUTunion))

LPINPUT = INPUT * 1
pInputs = LPINPUT(INPUT(INPUT_MOUSE, _INPUTunion(mi=MOUSEINPUT(200, 200, 0, MOUSEEVENTF_MOVE, 0, None))))
cbSize = ctypes.c_int(ctypes.sizeof(INPUT))

while True:
    ctypes.windll.user32.SendInput(1, pInputs, cbSize)
    time.sleep(240)