Schema History displays the list of updates that have been installed in the schema for the selected directory.  If known, this includes displaying the name associated to the update.  To do this NetTools has a list of predefined names for common schema updates.  This post provides the names of the updates that are predefined in NetTools and how to configure NetTools with user defined names.

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To configure NetTools to display a user defined name the NetTools.ini file must be manually updated with the name of schema attribute or class that was added by the update. The details of the manual updating the configuration files are provided below.

[SchemaUpdates]
<ldapdisplayname> = <Schema update Name>

ldapdisplayname is the name of the attribute or class which will be added by the update schema update name is the name that NetTools will display if the attribute or class is found

Also See HowTo: Find what Schema updates have been performed