Force.com IDE Developer Guide

Get Started with the Force.com IDE
Develop with the Force.com IDE
Test Code with the Force.com IDE
Deploy Code with the Force.com IDE
Get Started with the Apex Debugger
Get Started with the Apex Debugger
Set Up the Apex Debugger
Explore a Simple Debugging Puzzle
Manage Debugging Sessions
Apex Debugger Limits and Considerations
Apex Debugger Troubleshooting
Get Started with the ISV Customer Debugger
Set Up the Apex Debugger
Set Up a Debugging Session
Create an Eclipse Workspace
Log In to a Customer Org
Start a Debugging Session
Debug Your Project
Renew a Debugging Session
Delete Your Copy of Your Customer’s Code
ISV Customer Debugger Limits and Considerations
Force.com IDE Release Notes
Useful References
PDF

Set Up a Debugging Session

Setting up an ISV Customer Debugger session is different from setting up sessions for the Apex Debugger. After you create an Eclipse workspace, log in to your customer’s org, start a debugging session from Setup, and then debug your project.

User Permissions Needed (in the License Management Org)
To view the Apex code in your packages, and debug code with the Apex Debugger, when logged in to subscriber orgs via the LMO: View and Debug Managed Apex
To manage ISV Customer Debugger sessions from the LMO: Modify All Data

AND

View and Debug Managed Apex