When logging in you choose the window manager (KDE, Gnome, etc) from the Menu button on the bottom right of the login window. All of the Gnome applications are accessible from the default KDE window manager. If teh the applications aren't on the Menu, either right click and choose Menu Editor to manually add applications or Utilities => Desktop => Menu Updating Tool and it should scan for all applications that don't appear in the menu. Select the appropriate checkboxes and thay will be added.
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