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Where an X display manager is employed, a login session is considered to be the lifetime of a designated user process that the display manager invokes. On Windows NT -based systems, login sessions are maintained by the kernel and control of them is overseen by the Local Security Authority Subsystem Service (LSA).
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When the computer system is executing on behalf of a user application, the system is in user mode. However, when a user application requests a service from the operating system (via a system call), the system must transition from user to kernel mode to fulfill the request. User mode avoids various catastrophic failures:
The system, and software upgrades, are shipped from BAE Systems in a secure fashion. For customers who want them, XTS-400 supports a Mission Support Cryptographic Unit (MSCU) and Fortezza cards. The MSCU performs type 1 cryptography and has been separately scrutinized by the United States National Security Agency.
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Then the operating system calls the switch() routine to first save the general-purpose user registers of A onto A's kernel stack, then it saves A's current kernel register values into the PCB of A, restores kernel registers from the PCB of process B, and switches context, that is, changes kernel stack pointer to point to the kernel stack of ...
Parallel running is a strategy for system changeover where a new system slowly assumes the roles of the older system while both systems operate simultaneously. [ 1 ] [ 2 ] This conversion takes place as the technology of the old system is outdated so a new system is needed to be installed to replace the old one. [ 3 ]