If you change your system clock, and login to a BYOND game, the pager will give you an alert popup about your system clock being off. However, this popup gets easily lost behind the game, or anything else that you might have going on. More importantly, your system clock being off seems to completely break in-game popups (like alert(s)). This can be tested on The Planet's server of HU2, since there is an alert at login that will black-screen you until accepted.