the bitcoin magazine has an interesting article related to the brain wallet;
http://bitcoinmagazine.com/brain-wallets-the-what-and-the-how/what really picked my interest was the offline transactions section at the end of the article. there is a set of instruction related to the blockchain service offline transaction. the 3rd item of the instructions states the following
"Log in from a secure computer in offline mode, making sure to use private browsing mode (incognito mode in Chrome). When the system asks you to turn off your internet connection, do so."
My question is: what does it mean to 'log in offline mode'? log into what? the browse? computer? blockchain server? and if so how?