veriable scope of map datatype

i am making modification to an existing research application, and i am having trouble with map data type.

what is the scope of map data type variables? are these globally accessible or they have local scope. The code i am using declares map variables with in class with out static or extern keyword and they are shared among all classes, can some one please clarify this? please
I don't understand. Could you post a code example?
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