Distributed Txns across 2 processes/machines

[JF]

I have two Java Stateless Session Beans with CMT running on different 
boxes being controlled by the same TransactionManager.
Each aquires a JDBC connection through JNDI to a 
org.apache.derby.jdbc.ClientXADataSource which points to the same 
physical networked Derby server instance - i.e. the connection URL is to 
the same machine and port; jdbc:derby://dbserver:1527/ExperimentDB
The first bean inserts some data into a table and then calls the second 
bean on a different box which attempts to find the data which has just 
been inserted.

My question is IFF the TransactionManager has propgate the transaction 
context correctly to the second box so the second bean is participating 
in the same global distributed transaction, will Derby allow the second 
bean on a different box to 'see' the uncommited data which is part of 
the distributed transaction?

I only ask as I cannot and assume that it is because I have not set up 
the TransactionManager/Cluster correctly, if Derby cannot 'possibly' 
make the changed data available to the second transaction then I am 
wasting  my time.

Thanks.