The Message Queue Interface overview

The Message Queue Interface consists of the following:

Calls through which programs can access the queue manager and its facilities
Structures that programs use to pass data to, and get data from, the queue manager
Elementary data types for passing data to, and getting data from, the queue manager

IBM® MQ for z/OS® also supplies:

Two extra calls through which z/OS batch programs can commit and back out changes.
Data definition files (sometimes known as copy files, macros, include files, and header files) that define the values of constants supplied with IBM MQ for z/OS.
Stub programs to link-edit to your applications.
A suite of sample programs that demonstrate how to use the MQI on the z/OS platform. For further information about these samples, see Using the sample programs for z/OS.

IBM MQ for IBM i also supplies:

Data definition files (sometimes known as copy files, macros, include files, and header files) that define the values of constants supplied with IBM MQ for IBM i.
Three stub programs to link-edit to your ILE C, ILE COBOL, and ILE RPG applications.
A suite of sample programs that demonstrate how to use the MQI on the IBM i platform.

IBM MQ for Windows and IBM MQ on UNIX and Linux® systems also supply:

Calls through which IBM MQ for Windows and IBM MQ on UNIX and Linux systems programs can commit and back out changes.
Include files that define the values of constants supplied on these platforms.
Library files to link your applications.
A suite of sample programs that demonstrate how to use the MQI on these platforms. For further information about these samples, see Using the sample programs on Multiplatforms.
Sample source and executable code for bindings to external transaction managers.

Use the following links to find out more about the MQI: