First you must decide what usage data you need. The IFAUSAGE macro
supports collection of the following:
all CPU time for an address space
all CPU time for a task
CPU time for a function
data other than CPU time for a function.
In all cases you must identify the product for which usage data
is to be collected. Use REQUEST=REGISTER on the IFAUSAGE macro to
identify the product and to begin data collection. Issue REQUEST=DEREGISTER
to end data collection.