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The name of the channel (B) is taken from the Title field on the General tab in the Channel Configuration panel. To show a different Channel name on the Login page, modify the "Title" field on the General tab in Channel Configuration. For example:
Customizing the Announcement
By default no announcement is shown on the XperienCentral Login page, however you can add one. The Announcement text is defined in My Settings. See Announcement for complete information. For example: