What is updated when update ???

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http://forums.fedoraforum.org – Maybe a stupid question, but... when I choose update software from the administration tab in F10, there is made an update to ALL installed programs or only for the base one ? I mean, if I installed something like sunbird or k3b or adobe (that are not included in the DVD installation), they are also updated or I must separate check for updates for these programs ? Thank you ! (HowTos)