list
The list library allows you add and retrieve values to and from lists. The list library is basically a fancy wrapper for a table, but with much more limited functionality. See Default Lists for a page of default Sandbox lists.
Methods
boolean list.Contains( string list, any value )
Returns true if the list contains the value. (as a value - not a key)
For a function that looks for a key and not a value see list.HasEntry.
table list.GetForEdit( string identifier )
Returns the actual table of the list stored at identifier. Modifying this will affect the stored list