Explore: System Service Calls

for example, privileged system code also issues system calls. For embedded systems, system calls typically do not change the privilege mode of the CPU

calls to the emergency telephone number were often routed over special dedicated circuits. Though with the advent of electronic exchanges these calls

A call recording service is a commercial enterprise that can record telephone calls for a fee. For example, a lawyer needing to record conversations with

alerts TSPS operator of a new call. 440 Hz 5 ms. Problems playing this file? See media help. The Traffic Service Position System (TSPS) was developed by Bell

The Selective Service System (SSS) is an independent agency of the United States government that maintains a database of registered male U.S. citizens

of users, different call types are possible via relay services. Once the most common type of TRS call, TTY calls involve a call from a deaf or hard-of-hearing

National Park Service (NPS) is an agency of the United States federal government, within the U.S. Department of the Interior. The service manages all national

answering service operators also had the option of calling the client and alerting them to particularly important calls. The origins of call centers date

Emergency service response codes are predefined systems used by emergency services to describe the priority and response assigned to calls for service. Response

subsatellite. Sector 2 (70°) contained the service propulsion system (SPS) oxidizer sump tank, so called because it directly fed the engine and was kept