NAS is a software suite that enables applications to be

integrated across a distributed network of multivendor

systems: NAS services are divided into four main groups:

- Application Access Services which support user interface

(forms based,graphical or character terminal based)

- Communication and Central services which support

communications using electronic mail and EDI

- Information and resource sharing, which supports

database access and compound documents (collection of

images, graphics and conventional text)

- System Access services which provides a standard

operating system interface.