Windows Server 2000
Windows Server 2003
Security Enabled Local Group Member Added
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Member added to security local group. "Caller user" added "member name" to the "target" group. Member may be a user, computer or another group.
AD has 2 types of groups: Security and Distribution. Distribution (security disabled) groups are for distribution lists in Exchange and cannot be assigned permissions or rights. Security (security enabled) groups can be used for permissions, rights and as distribution lists.
AD has 3 scopes of groups: Local, Global, Universal. See knowledge base article 326265.