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If the check box for a JRE is not selected, then Java Plug-in and Java Web Start will not use the JRE to launch Java applications.
Assertion is disabled in Java Plug-in code by default.
It is normally transparent to the user, but can be viewed in the Processes tab of the Windows Task Manager.
If you do not want the scheduler to run, use the The Desktop Settings tab shows information about the JREs that are installed on your system and enables you to choose the JREs that you want to use to run applications that are embedded in a web page or launched from a browser.
The table always has at least one entry, which is the most recently installed JRE.
This is the JRE that is associated with the Java Control Panel.