... headerfilesfor itslibraries. Each of thesefilescontainstheinterfacedescriptionsofall of theclassesofalibrary ;the name of theheaderfilematches th enameofthe library.Thus,inthe examples so far,which haveonlyused ... anothertopicfor which knowledge of thecontents of theQtlibrariesisofparticularinterest. Besidesthe headerfilesforindividualclass definitions,whose filenames matchthe namesofthe classestheydescribe,Qtalsoprovides ... andaslotinadestinationobject .The first twoargumentsspecifytheobject sendingthe signal andthe signal that wewanttobindtothereceivingslot. Thelasttwoargumentsspecifytheobject that is therecipient of the signal,and thereceivingslot....