This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
1. Each session is logging in with different attributes, either because they're different account logins or because the login script is constructing some sort of resource that's different with every login.
2. The two sessions are identical, but getting into resource conflicts.
More than that I can't say without details about what's "different" about them.
Customer surveys are for companies who didn't pay proper attention to begin with.