BNSF Mainframe Emulator



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Applet Load Problems

If you experience problems where your browser will not successfully load and display the mainframe emulator
java applet, you first need to ensure that your computer meets the system requirements for the emulator product.

Updated information as of Monday, July 26 @ 15:15 CDT
The applet load issue has been resolved for many Windows XP / Internet Explorer users by performing step 1 and step 2 below. Once complete, if you still encounter problems, please continue with steps 3 through 6.

1. Installing the Microsoft Windows XP Service Pack 1 from windowsupdate.com.

2. Installing the updated Microsoft Java Virtual Machine for Internet Explorer by following these instructions:

  • Click the link above to download the VM.
  • Click [Open] from the download window.
  • Do not check the box to remember this setting next time. Note: If you have ever clicked the 'remember this setting' button, you may not be prompted.
  • When prompted to install the Microsoft VM, choose 'Yes' and accept the license agreement.
  • Reboot your computer.
  • Re-enter this site and confirm that the emulator is working. If not, continue with the steps below.

3. Ensure the browser's Java Settings are configured correctly. If the browser settings include a section for the Sun JVM, ensure the these options are turned off (i.e. deselect the checkboxes in this section).

4. Please clear the browser's cache and delete all offline content, close all browser windows and attempt to access the emulator again.


Following are optional browser parameters that may help applet load issues. While these settings have been found to resolve the applet loading issues on internal BNSF computers, the decision to change the configuration of a home computer lies solely with the computer owner.

5. Advanced Privacy Settings
In Internet Explorer 6.x, the advanced privacy settings can be configured as follows:
Select Tools -> Internet Options to open the "Internet Options" dialog window.
From the Internet Option dialog select the "Privacy Options" tab as follows:


Next, click the "Advanced" button:


Place a check in the "Override automatic cookie handling" and
"Always allow session cookies" checkboxes and then click the "OK" button.


6. Restart the browser and attempt to access the mainframe emulator again.