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<concept id="GUID-28AD51DC-C101-5E6E-9EC3-C2B61400D8CD" xml:lang="en"><title>Generic Usability Library</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>The EUser High Level library introduces the a new L-class idiom. The ‘L-Class’ idiom provides a clear indication of the new leaving behaviour of these classes, in order to distinguish them from existing Symbian classes and improve usability and understanding. The L prefix denotes that these classes may be Liberal when it comes to Leaving, while being Leave-safe themselves.</p> </conbody></concept>