application protocol

I could not understand what the meaning of these..

Quote:

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Suspicious Protocol Activity:
Modifications to application protocol that could provide
information or access information that would be used for
attacks.

Errornous in traffic:
Traffic anomalies

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The meaning of application protocol

Questions:
1. How to modify application protocol? Is it Web browser or Windows Media Player is one of them?
2. Some example situation where traffic anomalies exist.

The name "Application Protocol" is an OSI model term.. It's an "abstract description for communications and computer network protocol design". More about the OSI 7 layer model can be found here:

http://en.wikipedia.org/wiki/OSI_model