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Email User Reference replaces CCK's default userreference widget with an autocomplete field that works with users' email addresses, searching by email address instead of usernames.
This set of modules integrates the Rangy library into Drupal 7.
Three modules are included :
1) Rangy : the core Rangy module defines Rangy types and allows you to enable
them on field instances. This module won't do much by itself and needs a
'reaction' module.
2) Rangy enities : defines fieldable entities. This module is supposed to be
used by 'reaction' modules. Enable it only if another module instruct you to
do so, or if you wish to create a module which is built upon entities.
3) Rangy annotations : a reaction module which depends on Rangy entities to
create an annotation system.