How do I close a PDF document automatically when the browser is closed?

I have a web app writen in HTML/ASP. In order to acccess this app, our users have to enter a password and user id. Once on the main page of the app, they can click on a link which opens the reader in another window. Quite often, when finished with the app, they close the browser, but leave the reader window open (with sensitive information). It is becoming to riskly to hope that they remember to close that window also, even with visual reminders. I would like for that window to close automatically when the browser with the app is closed.
Can this be done?

Let me elaborate a little more on what I am trying to do.
(1) A website (#1) is opened after entering a UID and PWD.
(2) Within website #1, a link is clicked which opens a second web app (#2) in a seperate window using window.open().
(3) Within website #2, a user can click on a link which opens a PDF as _SELF.
(4) If the user:
(a) exits out of website #1 by closing the brower
(b) we would like to automatically close the PDF from website #2 also, as this contains sensitive information and most of the time the users are forgetting to close it

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Hope this helps...
Refer note : 904155
from SAP Note 904155----
Symptom
A BSP application is not terminated correctly when the user closes the browser window or navigates to other URL.
The popup window, which appears on browse closure, contains the
text representing <img> HTML element content in the escaped
form, like that:
<IMG WIDTH=quot; HEIGHT=quot; SRC="...
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Other terms
Business Server Pages, WebAS, sessionexit, session termination, SM12, SM04, SYSTEM, session_single_frame.htm
Reason and Prerequisites
Reason:
The problem is caused by the minor code inconsistency in BSP application SYSTEM -> page SESSIONEXIT.HTM.
Prerequisites:
1. The application is using the SYSTEM application page SESSIONEXIT.HTM for logoff. When it runs, suddenly HTML source code appears on the logoff screen.
2. SAP_BASIS 620 SP57 or SAP_BASIS 640 SP15 or SAP_BASIS 700 SP06 are installed.
Solution
Please install SAP_BASIS 620 SP58 or SAP_BASIS 640 SP16 or SAP_BASIS 700 SP07
or
apply the code correction as described below:
1. Go to BSP Application SYSTEM.
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Arun
P.S Assigning points is a way of saying thank you on SDN
Message was edited by: Arun Varadarajan

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Let me elaborate a little more on what I am trying to do.
(1) A website (#1) is opened after entering a UID and PWD.
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