Re-post from last week
That one's interesting as well, given that it is well asked and the answers reveal something which not everybody knows. One could write about administrative shares in more detail in the blog then.
Security Concern with my Windows 7 Box at Work
The group I'm in recently got new computers at work. They gave me a new computer and hooked up my old computer to the network for a week so I could take my time transferring necessary files/configs etc. The Support Guy said, "Just go to 'run' and type in \PCNAME\c$. So I did and, low and behold, there's my old C: drive. I thought to myself, "What a huge security issue. I'll just transfer everything quickly and then 'un-share' it." [...]