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U
units of measurement for time 1, 2
units, world
unlinking external casts
unloading
   cast members from memory
   movies from memory
unlocking sprites
Update Movies command 1, 2
updating
   frames
   registration points
   Score 1, 2, 3
   Stage
updating movies from older versions
updating the Stage
upper-case letters, using in Lingo 1, 2
URL, navigating to
URLs, maximun length
URLs as references in Lingo
URLs, Shockwave Audio cast members and
Use Movie Settings option
Use System Temporary Memory option
user data
user interaction, overview
user levels 1, 2
UserLevel setting
userLogOff
userLogOn
Users command
Users Log On and Off command
users, number connected