What exactly are the advantages of the session hashes?

[slip]

vB2 obviously integrated session hashes into the urls..
whats the point of them, and why would they work better then cookies?

and, how come when you give the url to another person, that they don't end up logged in under your user name?

[leadZERO]

Some users that are accessing the page over a proxy can't use cookies. By using the session hash they can use the program as if cookies were used.

[slip]

so unless i'm using a proxy, theres no real reason for having it enabled?

[YellowKard]

You may not be, but some others on your board are sure to access through a proxy at some point.