He was an excellent diagnostician, but when he was unsure or stumped by a set of symptoms he would outright just use Google. All the partners at the practice did. The skill was then sorting the wheat from the chaff in the search results, and then making the correct decisions for treatment.
Doctors don't just use specialist software to look things up, they often just use Google like the rest of us, it's bloody fast and with personalisation of search results, it often returns answers most relevant to you (or your profession).