The major problems with multiple networks are as given:

• A computer attached to a given server can only interact with other computers attached to the similar network.

• In the 1970s large organizations start to acquire multiple networks. Every network in the organization formed island. Employees required to select a computer appropriate for each and every task. So they required multiple screens, computers and keyboards.

UNIVERSAL SERVICES:

A interaction system that supplies universal services allows arbitrary pairs of computers to interact. Universal service is required because it increases individual productivity.