Recently I reformatted my PC, which previously had Visual Studio installed on it.
In Visual Studio, under Server Explorer -> Windows Azure Storage, before reformatting, I had a storage account configured for one of my hosted services in Azure. When I configured it, the "Remember My Account Key" was checked.
After reformatting, this account was gone, as expected. However, when I went to reconfigure the account, I noticed that it automatically populated the "Account Key" field with the valid key.
How does Visual Studio remember this option?