Cockpit midget-door on DC3?

At Oshkosh, I was noticing that DC3s have a little half-height door
behind and below the pilot's seat, and about one, maybe two hairs
forward of the left prop. There's a good picture on this ebay auction
(scroll down):
http://cgi.ebay.com/ebaymotors/1944-DC-3-C47-Multi-Engine-Aircraft_W0QQcmdZViewItemQQcategoryZ63678QQitemZ45 68256276QQrdZ1QQsspagenameZWDVW

What is this door for? I was discussing it with a friend and the best
idea we could come up with was immediate, grisly death.

~Adam Aulick

postscript: if anybody here is considering auctioning their DC3 on ebay,
with pictures showing faded paint, water driplines, and equipment piled
up under the wings, you might want to mention whether or not it's
airworty....