Modifying multiple databases in one transaction - no TransactionScope

I know I can use TransactionScope - Implementing transactions over multiple databases

But there are classes TransactionManager and Transaction having methods for enlisting durable and volatile transactions and for recovery. However I can't find good code examples of how to use it. I don't know i开发者_Go百科f they give something else then TransactionScope. Can you explain what are differences? When to use which? And do You have any code examples?