Storage

A stack is stored in a stack segment (SS)

Creation

A program or operating system/executive can set up many stacks.

For example, in multitasking systems, each task can be given its own stack.

Current

When a system sets up many stacks, only one stack—the current stack—is available at a time. The current stack is the one contained in the segment referenced by the SS register.

Number

The number of stacks in a system is limited by:

• the maximum number of segments
• and the available physical memory.