HP/UX 2 GB shared memory segment

Question to Informix & HP/UX guru's, on shared memory segments greater than 2 GB for HP/UX 11.0 using Informix 7.30UC3-1. First, apply OS patch PHKL_16236 to HP/UX 11.0 then refer to 7.30UC3 release notes item 18 where it refers to the 'chatr -M <executable>' command (change attribute). It discusses the SHMEM_MAGIC feature to enable the OS to access 1GB of memory above the 1.75 GB limit (actual limit without the patch). This SHMEM_MAGIC feature effectively supports 2.75 GB of shared memory. The question is which specific Informix binaries require execution as SHMEM_MAGIC enabled (ie chatr -M <informix executable>)? Is it all the members in the IDS bin directory or a subset as those listed as BRAND in the 7.30UC3 'IDSfiles' (residing in informix/etc subdirectory formally in 'onlinefiles' file of same directory)? With SHMEM_MAGIC enabled why does the Informix resident and virtual portion of shared memory occupy 2 separate memory segments (not shared as given by onstat -g seg command if the instance size is < 1 GB). If there are additional questions as to specifics or clarifications I would be glad to respond. Regards, Ed Rollings erollings@icrr.com