So the Work Area Service for J2EE is a caller initiated session created using 
the UserWorkArea jndi binding with the call boundaries set by the 
begin/complete calls:


  | package com.ibm.websphere.workarea;
  | 
  | public interface UserWorkArea {
  |    void begin(String name);
  |    void complete() throws NoWorkArea, NotOriginator;
  | 
  |    String getName();
  |    String[] retrieveAllKeys();
  |    void set(String key, java.io.Serializable value)
  |       throws NoWorkArea, NotOriginator, PropertyReadOnly;
  |    void set(String key, java.io.Serializable value, PropertyModeType mode)
  |       throws NoWorkArea, NotOriginator, PropertyReadOnly;
  |    java.io.Serializable get(String key);
  |    PropertyModeType getMode(String key);
  |    void remove(String key)
  |       throws NoWorkArea, NotOriginator, PropertyFixed;
  | }
  | 

Like I said, this is something that could be built on top of the current 
invoker implementation using a valve/filter in the web tier and interceptors in 
the ejb proxy and container. 

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