U

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UI (user interface) permissions
     configuring
     demanding for unmanaged code 2nd
UIPermission class
UML symbol for an interface
UnauthenticatedPrincipal value (PrincipalPolicy)
UnauthorizedAccessException class
unbounded types
UNC (universal name convention)
undisciplined subscriber problem
Union( ) (IPermission)
unique identifiers
     for shared assemblies
     globally unique (GUIDs)
     thread ID
universal name convention (UNC)
Unload( ) (AppDomain)
unlocked code, interleaving with locked code
unmanaged code
     access permission, asserting
     declaratively asserting access permission and demanding UI
unnamed slots 2nd
unreachable objects, garbage collection of
Unregister( ) (ILease)
UnregisterChannel( ) (ChannelServices)
unsafe code
UnsafeFire( ) method
Unsubscribe( )
Untrusted Certificates list
Untrusted Sites zone
     default permissions
untrusted sites, preventing code execution from
unverified certificates
Unwrap( ) (IObjectHandle)
UpgradeToWriterLock( ) (ReaderWriterLock)
URIs
     client-side type registration
     host type registration 2nd
     server-activated objects hosted in IIS
URL evidence
UrlAttribute class
UrlIdentityPermission class
URLs
     activation URL for object registration
     client-side type registration 2nd
     for remote objects
     host type registration
     Local Intranet security zone, identifying as
user authorization
user groups (Windows), drawbacks to
User security policy
     configuring
     default configuration
     full trust permissions for CLR assemblies
     storage in XML-formatted file
     Trust Applications node
     Trusted Applications node
user-oriented security model
UserManager web service (example)
usernames, obtaining from principal object
using statements 2nd
     aliasing particular combination of specific names
     generics and
     interfaces and