From Allearsnet.com:
Extra Magic Hours are available to Disney Resort guests at select theme parks on select days. When resort guests enter the park for evening Extra Magic Hours, they go to a designated location for a wrist band. This easily identifies them as a resort guest to Cast Members
One of the difficulties, especially for the evening Extra Magic Hour, has been clearing the park of non-resort guests. Walt Disney World will test a new procedure from February 24 - 29, 2008. Each Disney Resort Guest will need to carry (and show) their valid Disney Resort Key to the World Card for access to the theme parks for evening Extra Magic Hours. Wristbands will not be issued. Be sure to have your Resort ID available as you enter any attractions
Extra Magic Hours are available to Disney Resort guests at select theme parks on select days. When resort guests enter the park for evening Extra Magic Hours, they go to a designated location for a wrist band. This easily identifies them as a resort guest to Cast Members
One of the difficulties, especially for the evening Extra Magic Hour, has been clearing the park of non-resort guests. Walt Disney World will test a new procedure from February 24 - 29, 2008. Each Disney Resort Guest will need to carry (and show) their valid Disney Resort Key to the World Card for access to the theme parks for evening Extra Magic Hours. Wristbands will not be issued. Be sure to have your Resort ID available as you enter any attractions