I can only answer the first question. When you install the desktop version of Google Drive you tell it which account to sync to. Unfortunately, right now you can only sync it to one or the other.
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Tim Maki, Director of Technology, Tilton School
30 School St., Tilton, NH 03276
Twitter: @timmaki
"Computers are incredibly fast, accurate and stupid. Human beings are incredibly slow, inaccurate and brilliant. Together they are powerful beyond imagination." - Albert Einstein