those uses are correct, i'll give you that. but in a minor clause like "Thanks, Andy" there is no other clause (i.e. 'for writing that virus') behind it or that we can assume is implied. nor is there anything in-between the "thanks" and the comma. Basically, we can't assume anything that isn't there. if there was another clause after Andy with another comma, then it would definately be an address to him. however, since there is no such clause, it is in fact a signature from an unknown Andy.
tagged for bad title because it made me worry about my macbook pro, when the article never mentions macBOOKs, only mac PROs specifically...
those uses are correct, i'll give you that. but in a minor clause like "Thanks, Andy" there is no other clause (i.e. 'for writing that virus') behind it or that we can assume is implied. nor is there anything in-between the "thanks" and the comma. Basically, we can't assume anything that isn't there. if there was another clause after Andy with another comma, then it would definately be an address to him. however, since there is no such clause, it is in fact a signature from an unknown Andy.