Migrating from Centura/Gupta to Oracle forms

Hi
I work at an organistion that is the result of a merger, we have two main bespoke systems, one in Oracle Forms which has recently been upgraded to the web based version (6.5) and a second written in Gupta / Centura SQL Windows client server. Both use Oracle databases thought the Centura application is still on 8i.
We want to move to Forms over time but will have to run both for a while and would like to try and run them as more of a single system in the interim. e.g a single security system so users can move from one to the other without having to use 2 userids & passwords. My initial investigations suggest this isn't going to be easy.
I wondered if anyone had any experience/ tips, or could point me at any useful resources.
Thanks

We want migrate from gupta 9.0 (sql base) to oracle db 11.1. We need some help or information. Could you give us any procedure of migration ?
Thanks you. We hope for your help.

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