1. Overview

2. Usage of Non-blocking Calls

2.1 Syntax of Non-blocking Calls
2.2 Basic Deadlock
2.3 Conclusions: Non-blocking Calls

3. Determining Information about Messages

3.1 Wait, Test, and Probe
3.2 Status and Get_count

4. Special Parameters

4.1 Wildcards
4.2 Null Parameters

5. Programming Recommendations

6. References