Does ATC Radar Contact VFR A/C?

Does ATC Radar Contact VFR A/C? If so, do they provide positive or advisory control?
Update: But an A/C cannot just fly through class B,C, TRSA without contacting the appropriate controller correct? Also, would a VFR A/C not requesting flight following keep a 1200 code? And one requesting flight following would be assigned a non-discrete beacon code correct?

Ryan
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