IBM WebSphere MQ Workflow
C API Examples
fmcaexit.c 
How to make use of the authentication exit
fmctjbas.c 
How to establish a session and handle the logged-on user
fmctjchk.c
How to check out or check in work items
fmctjitm.c
How to operate on work items and notifications
fmctjmon.c
How to monitor a process instance
fmctjcim.c
How to implement an activity handling any kind of container
fmctjprc.c
How to operate on process instances
fmctjtmp.c
How to operate on process templates