Neptunus Rex
With a little co-ordination, Bahrein could have changed all traffic to a secondary freq, allowing Dubai to use the Bahrein freq as a discrete.
1. What makes you think ATC units can select the frequencies of other ATC units? We certainly can't in Bahrain (note the spelling).
2. What makes you think there wasn't more than a "little co-ordination" going on during this sad event?
3. What makes you think that all non-necessary traffic wasn't switched to a secondary freq, but, as is common, every man and their dog listens in on box 2 anyway?
Give us a little credit.