Hello. I've been finding the way to determine whether
the process is running as service or not. Does this way
work? On my environment, True is returned. I hope False
will be returned in service environment.

http://msdn.microsoft.com/en-us/library/d56de412%28v=VS.80%29.aspx
http://msdn.microsoft.com/en-us/library/ms683225%28VS.85%29.aspx

/////////////////////////////////////////

from __future__ import print_function
import ctypes
from ctypes.wintypes import *

UOI_FLAGS = 1
WSF_VISIBLE = 0x0001

class USEROBJECTFLAGS(ctypes.Structure):
    _fields_ = [("fInherit", BOOL),
                ("fReserved", BOOL),
                ("dwFlags", DWORD)]

def window_station_has_display_surfaces():
    dll = ctypes.windll.user32
    h = dll.GetProcessWindowStation()
    if not h:
        raise ctypes.WinError()
    uof = USEROBJECTFLAGS()
    needed = DWORD()
    res = dll.GetUserObjectInformationW(h,
        UOI_FLAGS, 
        ctypes.byref(uof),
        ctypes.sizeof(uof),
        ctypes.byref(needed))
    if not res:
        raise ctypes.WinError()
    return bool(uof.dwFlags & WSF_VISIBLE)

def main():
    print(window_station_has_display_surfaces())

if __name__ == '__main__':
    main()