AT&T is a US-based telecoms company, and the second largest provider of mobile services and the largest provider of fixed telephone services in the US.
AMS Programming Languages And Frameworks Technology
COBOL (Common Business-Oriented Language) is a computer programming language designed for use in business, finance, and administrative systems and widely used in applications deployed on mainframe computers, such as large-scale batch and transaction processing jobs.
JCL (Job Control Language) is a scripting programming language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem.