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what if someone came over a visitors visa or a transit visa and did not go back, technically he/she did not enter / crossed the border illegally!
 
what if someone came over a visitors visa or a transit visa and did not go back, technically he/she did not enter / crossed the border illegally!

Yes, that's correct. However it's still possible for them to be in Canada illegally if they have remained in Canada beyond their allowed visit without applying for an extension.

You would have to provide us with the details of the situation you are asking about for us to really answer your questions.
 
situation is the same
I came over to canada on transit visa, and now I am living here
what should I do to convert my status?

How long ago did you arrive?