Question

What is the minimum number of segment registers that are necessary to provide segmentation? How do access common data for different programs using segmentation?​

Answer 1

Explanation:

It allows to processes to easily share data. It allows to extend the address ability of the processor, i.e. segmentation allows the use of 16 bit registers to give an addressing capability of 1 Megabytes. Without segmentation, it would require 20 bit registers.