It is used to control the lowest level of the security mechanisms and also to maintain the integrity of the system.

It is used to check the trusted software provided in the mobile phone by Symbian and others such as the UI platform provider and the phone manufacturer.

It is used to gain access to a system resource and system resources take the form of services provided via an API.

It is the smallest part of the system that the processes can fully trust. 

('one', 'two', 'three', 'four', "hello how")

['one', 'two', 'three', 'four', "'hello how'"]

('one', 'two', 'three', 'four', 'hello how')

['one', 'two', 'three', 'four', 'hello how']