Originally Posted by
jjclancy
Actually you missed milski's point. At some point of the booking/ticketing process there is a gate wide enough for only one transaction at a time. Transactions are queued in front of that gate. There is no "same" time on the queue; one transaction gets there first and wins.
+1. ^
Computers are serial devices. There is no such thing as exactly the same time. The internal clock of computer can easily distinguish differences down to less than one billionth of a second. Try doing that by hand at exactly the same time.
Even in the unlikely case of you succeeded entering both within one billionth of a second, internet transmission can easier make one earlier than the other. Different computers have different internet latency which will also affect actual time for transaction to reach UA computer. If you miraculous able to overcome all these, there is a central processing queue where one will be bounced behind the other.
