English: Our kernel is monolithic and also modular, for we can cozily insert and fancily remove loadable kernel modules in hypervisor mode at runtime. Transitions between modes are at the discretion of the executing thread, but transitions from lower to higher levels of privilege can take place only through secure, hardware-controlled gates that are traversed by executing special instructions or when external interrupts are received. Terek River Valley, Kazbegi, Georgia.