Why does OS fingerprinting happen before Application Fingerprinting

[alan donald <netquantum () yahoo com>]

I just ran a few scans with the OS probe and Version
probe check boxes checked. It appeared that the OS
detection is being done before the Version  detection.
Why is this so?  Is it some performance issue or is it
using this information in some way.

Or is this just random and the 2 types (OS vs Version)
of probes can be sent one before the other or vice
versa.



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