Oh great wise ones,

I am documenting a job for the HP3000 that has me confused.  This job has a
mixture of pre-process mpex commands and JCL.  As I understand how things work,
when the job is batched, the pre-process mpex commands are processed and then
the JCL commands.  This particular job seems to do things different.  The
following is an example:

::assign flag = 'Y'
::if flag = "Y" then
::   echo "flag = Y"
!   STREAMX A
::endif
::if flag = "N" then
::   echo "flag = Y"
!    STREAMX B
::endif

When job is run, the pre-process code decides if A or B is run.  When I look at
it I would say that it would do all of the pre-process commands and then run
BOTH A and B.  Any insight on why the job does what it does would be
appreciated.

Sincerely,
Jeff (AKA. Dazed and Confused)