What is a "virtual transaction"?

By the way, there are some products like WebMethods and Tibco saying their products 
perform transactions in SAP and also send their proprietary messages.

If SAP does support only local transactions and, according to the book J2EE Connector 
Architecture and Enterprise Application Integration by Sharma, Stearns and Ng not all 
SAP RFC support local transactions (some of them always commit). How can these 
products perform transaction involving their messages and multiple RFC call?

Ok, they must have implemented some kind of transaction manager of their own, but it 
still have the SAP restrictions and this whole thing does not seem to work.

It is more or less the same thing on IBM and BEA integration products based on J2EE. 
Up to what I could understand, they also say you can send JMS messages and perform JCA 
SAP RFC calls inside a MDB, example. If SAP does not support global transactions, how 
can they assure all messages and function calls will be performed in a atomic way?

Can anybody throw the light over me on the real functionality of those products?

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http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3828207#3828207

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