1. What is an:

a. Open subroutine?

b. Closed subroutine?

2. When is:

a. An open subroutine better than a closed subroutine?

b. A closed subroutine better than an open subroutine?

3. What SPARC instruction is used to invoke a (closed) subroutine?

4. What is a register window?

5. Which groups of registers are shared between register windows?

6. How many unique registers does each register window have?

7. How does a register window relate to a stack frame?

8. What SPARC instruction opens a new register window for a subroutine?

9. What causes a window overflow exception?

10. How does the system respond to a window overflow exception?