A Google is an Internet. There are multiple, physically distinct Internets, because if one uses search as the only navigation, the blue Google (IE on work PC, hone page Bing) does not let you see all the sites on the green Google (home PC, home page google.com). This makes sense because clearly work made it so you could only pick the educational Googles.
There is a BCC site on both Googles, but because Googles are physically separate, they must be copies of each other, like how Word at home is a copy of Word at school. If you save docs in one, they don't show up at the other. So you need one login for the blue Google BCC and one for the green Google BCC. Duh. You use your website number as a login name. It is like a telephone number: it lets you contact people, except instead of ringing their phone your message shows up on their website.
There is a BCC site on both Googles, but because Googles are physically separate, they must be copies of each other, like how Word at home is a copy of Word at school. If you save docs in one, they don't show up at the other. So you need one login for the blue Google BCC and one for the green Google BCC. Duh. You use your website number as a login name. It is like a telephone number: it lets you contact people, except instead of ringing their phone your message shows up on their website.