Page is a not externally linkable
netcommr - 3:06 am on Aug 23, 2003 (gmt 0)
w3.org defined the standards
1a yes
1b yes
2 no, they do not need to be next or associated with each other. when a class is defined, it will apply to every tag in the page with that class.
3 A plus (+) indicates that the preceding type, word, or group occurs one or more times. (this is waht your thinking of in question 2)
css2 specifications [w3.org]