asynchronous population of applets

Let's consider a case: we have two applets under which two business components are lying. The first buscomp is mapped to Siebel table, the second one - to a table which resides in another system, available only via DB link. As a consequence, whilst opening view with these two applets we sometimes have our Siebel interface hung up, because the remote system as a rule does not respond immidiately.

So the task now is to implement loading bar or something like that in place of the second applet whilst the data is loading there form remote system, but the first applet (and all other interface) should be available for any operations. Consequently, the second applet will display the data right after the request has been fulfilled.