This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma 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.
An IDE is no substitute for an Intelligent Developer.