This new book by Christopher Hale, HIMMLERS'S CRUSADE, The Nazi Expedition to Find the Origins of the Aryan Race, 2006, Castle Books, New Jersey, will give you those answers.
The short version is there were five Nazi's in Tibet and they were mostly looking for birds, sheep, grain seeds, and measuring the magnetosphere and the people who lived there. It is an exciting adventure story, one filled with spies, and intrigue and eventually war and death.
There are some good wargame scenarios in the book. The various British Empire officials that they encountered often tried to keep the Germans out of India and Tibet. They carried a few bolt action hunting rifles, but what if they carried better weapons and actually had to fight the British? They had large caravans of several different kinds of animals carrying tons of gear and food. They also considered plans to wage guerrilla warfare during World War Two as a way to keep British troops defending India. Check it out.
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