 Invisible "hides" calc.exe process in NT. You should not see it in
taskmgr, spyxx, pview, pstat, ...
 It can be used on one process and it's children:
 apihooks -o path\invisible.dll taskmgr.exe
or it can be applied to all processes via
 apihooks -o path\invisible.dll ALL
 If other calc.exe are started, their windows will not be hidden,
because FindWindow finds only the 1st calc's window. FindWindow
colud be replaced by GetWindowsText, but it is too slow and quite
danger.
 Invisible.dll must not be unloaded, because it has not implemented
unhooking (vs. Infilter2 examples).