It could be just about everywhere. I take it from your question that you do have the code for that application, but you didn't program it. Here are my three guesses as to what's happening:
- The limit could be configurable for instance so that value might be hidden in some configuration file.
- The application could also reference some library containing a control for which you do not have the source code and the value is hidden there.
- The joker who programmed this little gem thought writing out 160 is just to easy (and also to easily found by anybody) and thus hid the constant by calculating it:
- 160 == 10 * 16
- 160 == 2 * 5 * 16
- 160 == 2 * 5 * 2 * 8
- etc. etc. etc
My two (three :) ) cents!
Best regards,
-MRB