A %ARMINIT macro call
names the application and the users of the application. In addition,
it initializes the ARM interface if a previous %ARMINIT macro has
not been issued. Typically, it is executed when the application initializes.
The output is the _ARMAPID
variable, which is the application ID that was returned from the ARM_INIT
function call. If GETID=YES, then _ARMTXID is returned also. Any variables
for APPIDVAR= and TXNIDVAR= are updated.