SQLTableImportedKeys[conn] returns a table of primary key descriptions that are referenced by the table's foreign key.

SQLTableIndexInformation[conn] returns a table of indices and statistics for a table.

SQLTablePrimaryKeys[conn] returns a table of primary key descriptions.

SQLTablePrivileges[conn] returns a table of access rights about the tables in an SQL connection.

$DatabaseLinkDirectory gives the directory where DatabaseLink is installed.

EndModal[] is the head of an expression sent by Java to signal the end of a DoModal[] loop.

FrontEndSharedQ[link] returns True if the front end is being shared with a specified link, and returns False otherwise.

GetClass[javaobject] returns the JavaClass that identifies the object's class.

GetComplexClass[] returns the Java class used for complex numbers sent from, and returned to, Mathematica.

GetJavaException[] returns the Java Exception object that was thrown in the most recent call from Mathematica to Java.