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Starting Assigned SLDs 
The System Landscape Directory (SLD) manages all relevant information about software products and components that are or can be installed in your system landscape. Connection data of the JCo destinations is stored in the System Landscape Directory (SLD).
You can call the System Landscape Directory (SLD) with the Start assigned SLD pushbutton.

Note that you need administrator rights for this function. Otherwise you will not be granted access.
You have administrator authorization for the J2EE Engine and can access the System Landscape Directory (SLD) with a user.