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Kernel - namespace for classes and methods of the system Kernel module. No special code is needed to connect the module.

Class, namespace	Description
Application	Basic class for any apps.
Context	Class to handle context
HttpRequest	Class manages HTTP query object, containing data on the current query.
Authentication	Namespace for user authentication classes.
Config	Namespace for settings classes.
Data	Namespace for classes to handle cache, including managed cache.
DB	Namespace for classes that handle the database
Diag	Namespace for diagnostics classes.
Entity	Namespace to handle entities.
Environment	Class to handle environment.
Page	Namespace for classes that handle product page.
Replica	Namespace for classes to replicate kernel module.
Request	Class to handle query object.
Result	Query result class.
Security	Namespace for classes, responsible for security.
Server	Server objects class.
Type	Namespace to handle data types: date, file and others.
UI	Namespace for user interfaces.
UserTable	Class to handle users.
UrlPreview	Namespace to handle rich links.
UrlRewriterRuleMaker	Class to handle redirecting rules.
Web	Namespace for classes to handle WEB.
Classes to handle errors
Error	Class for errors.
ErrorCollection	Errors collection.
Classes to handle exceptions
SystemException	Basic class for fatal exceptions.
ArgumentException	Exception is thrown when function argument is invalid
ArgumentNullException	Exception is thrown when empty value is passed to the method that doesn't accept such value as valid.
ArgumentOutOfRangeException	Exception is thrown when the argument's value is outside acceptable value range.
ArgumentTypeException	Exception is thrown when the argument type is not accepted by function.
ObjectNotFoundException	Exception is thrown when object is missing.
ObjectException	Exception is thrown when object cannot be created.
ObjectPropertyException	Exception is thrown when object property is invalid.
InvalidOperationException	Exception is thrown when the called method is not valid for the current object status.
NotSupportedException	Exception is thrown when operation is not supported.
NotImplementedException	Exception is thrown when operation is not performed, but should have been.