After fix for CR 6932209 EBS 11i works correctly with
this fix in place, the html windows now opens in front correctly with the IE
default settings, tabbed browsing turned off and tabbed browsing fully
enabled.
Running EBS R12+ the html window often still opens behind with tabbed
browsing turned off and the default browser settings.
The reason for this change in behaviour appears to be due to the handling of
the second parameter value of web.show_document if it is calling anything
other than "_blank".

This is happening because of an unrecognized second argument for
@ showDocument(userUrl, "SOME_ARGUMENT");
@ If the 2nd argument is not among the supported list it should be treated as
@ "_blank".
@ Refer AppletContext document at
@ http://java.sun.com/j2se/1.4.2/docs/api/java/applet/AppletContext.html
@ .
@ When checking the transaction it fails when showing the following default
@ settings;
@ @ Executing SHOW_DOCUMENT Built-in:
@ @ In Argument 0 - Type: String Value:
@ @
@ http://ap481sun.us.oracle.com:6800/OA_HTML/RF.jsp?function_id=1015531&resp_id=
@
@ @
@ 20420&resp_appl_id=1&security_group_id=0&lang_code=US&params=uVAx-BLSytk5aYd
@ @ In Argument 1 - Type: String Value: APPS_NAVIGATION
@ .
@ Altering the second argument to _blank makes it work correctly;
@ @ In Argument 0 - Type: String Value:
@ @
@ http://ap481sun.us.oracle.com:6800/OA_HTML/RF.jsp?function_id=1015531&resp_id=
@
@ @
@ 20420&resp_appl_id=1&security_group_id=0&lang_code=US&params=uVAx-BLSytk5aYd
@ @ .
@ @ In Argument 1 - Type: String Value: _blank
@ @ .
@

Additional info:

@ The JDK only testcase is implemented here.
@ 1. Click on this URL
@ http://ap481sun.us.oracle.com:6800/OA_HTML/appletX.html
@ 2. Click on GO button.
@ You can see the new HTML page opens behind Applet.
@ ===============================================================
@ There is not much difference than what we gave testcase in JDK bug 6932209
@ Earlier we had in testcase been opening the new HTML page with "_blank"
@ Now in revised testcase we open new window using "APPS_NAVIGATE".
@ .
@ getAppletContext().showDocument(userUrl, "APPS_NAVIGATE");