Calling web applications from another web application

Hi everyone,
I direly need your suggestions on how to implement the following requirements:
I have a web application (i.e. App A). Then I have other web applications (i.e. App B, App C, App D, etc.) .
For each of the other apps (App B, App C, App D), I need to have 2 variable/attribute settings whose values are to be set (pre-defined) per user.
Meaning one user's values are different from another user.
In App A, I need to call App B, App C, & App D one by one to get the values of the 2 variables/attributes for a particular user accessing App A.
How should I implement this whole scenario such that I can set the values for 2 variables/attributes in App B, C, & D on a per user basis?
Please help me get ideas on what methods or work-arounds to implement in order to achieve this.
Thanks.
blm

Assuming this is running on a server, how about placing your data in application scope?
All applications have access to it. Just make sure every object put in application scope is uniquely named
and that your other application knows its name. One suggestion is to put a collection object (such as a List) in application scope and add items to it. This way, every application will know the collector's name. They can then search through the collection for any object addressed to itself. Just make sure you send data into and out of the collection in a thread safe way. such as by synchronization.
Here is an example of an object that you can store in the collection:
MessageObject{
String fromApplication;
String toApplication;
String message;
}

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    \[removed by moderator\]
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