This can be accomplished in several ways but perhaps the easiest is to have a boolean (yes/no) field in the database called "unread". The field is set to "on" by default. When a user reads the message simply set the field to 0.
-N
The best answer would probably be to test it yourself. Modify your apps to record the date and time which they were run to a text file. If you see the same date/time then they're executing in parallel. Either way you'll have your answer... and more importantly... with your own scheduled apps.
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Unfortunately/Fortunately? Allaire's encryption is not all that great. There are many, many programs and source code available on the internet to unencrypt your templates.
How legal that is... I couldn't tell you since I'm not a laywer.
-N
Does it HAVE to be random or can it simply be unique? If what you're looking for is a unique number then try something like this:
year month day hour minute second = 010726105123
Now six digits would be a little less to work with but you could perhaps leave out some of the fields (like year)...
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