  Global Section Behaviour? 
 The Question is:
 
I am moving an application set from a VAX (VMS 5.4-1)
to an Alpha (OpenVMS 7.1-2).  The application is
in Fortran and uses global sections.  My question
is how do I get the section mapping to work on
the Alpha?
 
In one program, which runs as a detached
process, I use a Fortran OPEN to create a disk
file of the correct size (based on my global common
size requirements) if the file doesn't already
exist.  If it does exist, I skip the OPEN.
I then use the $CRMPSC routine to create and
map the section.  While the program runs, I
can use $INSTALL LIST/GLOBAL and see the global
section.  I wrote a little test routine to
write and read variables in the section.  The
writer writes, but the reader doesn't see the
changes.  I have made the page size adjustment
from 512 to 8192 but this has made no difference.
I have checked linker map files and they list
the section as global and everybody has it at
the same address.  I am totally stumped and am
ready to pull out what little hair I have left.
 
Any ideas?
 
 The Answer is:
 
  Save for the change in the page size, global sections operate the
  same -- Alpha systems use variable page sizes, with the minimum page
  size being 8192 and ranging up to 65536 bytes.  The VAX page size is
  permanently set to 512 bytes.
 
  Without specific details and (potentially) an example of the source
  code used or small reproducer, the Wizard might assume that the
  application attempts to overmap existing address space in the application,
  that different names might be used, that the application (incorrectly)
  assumes that it has knowledge of the names of image sections created by
  INSTALL, that group globals are in use and multiple UICs are present,
  or that there are any number of other problems in the code.
 
  C language examples of global section operations are available at the
  Compaq Solutions Aliance area of the Compaq Website -- this is the same
  area as the shareable image cookbook referenced by the OpenVMS Frequently
  Asked Questions (FAQ).
 
