Informix 7.31 & 64bit Solaris 7

Hi All , I have a question which I am hoping someone can answer. I know it might be better of asking some on the Sun Admin new group but it seems most you guys are more clued on the Mix of Unix & Informix than most systems admins. I have a Sun Ultra 5 with Solaris 7. Using the isainfo -b command it tells me it is 64 bit. I have installed Informix Database server 7.31 UC5-1 ( before I found out my machine was 64 bit) for 32 bit Solaris 2.6. I was told by Informix that the 32 Bit for 2.6 is compatible with 32 bit Solaris 2.7. I have started the Database server on Solaris 2.7 and do not seem to have any problems. I have created a stores database. Can anyone shed some light on this ? Does Solaris 7 64 bit support 32 bit applications or I am going to see problems ? cheers & thanks in advance. Pankaj