1 Rotation around the front-to-back axis is called roll. 2  Rotation around the side-to-side axis is called pitch. 3  Rotation around the vertical axis is called yaw.  The Ailerons Control Roll. On the outer rear edge of each wing, the two ailerons move in opposite directions, up and down, decreasing lift on one wing while increasing it on the other.
A System call is a mechanism used by an application for requesting a service from the operating system. Examples of the services provided by the operating system are allocation and deallocation of memory, reporting of current date and time etc.
In other parts of the globe, call accounting may be called call logging. These systems collect data from the initial sourceâs phone extensions or devices, whether that system is a PBX (News - Alert), iPBX or VoIP gateway. Costs are assigned to those calls which can become a revenue stream.