Hi mil,
Security rights in Adagio are saved by company, so what you are asking is failry easy to do. Essentially, you will use a different security group than the other user.
In the company that you both access, create 2 security groups from File / Groups, one for you and one for the other person (say A and B). Give the appropriate access privileges to each group. Then from File / Users, assign your login and the other person's login to the respective groups (say you get A and the other gets B).
Then for this other company where only you have access, you still create the exact same group codes A and B from File/Group setup, but you can assign different privileges. Here, give group B only access to File/Open and Exit and nothing else.
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Regards,
Softrak Tech Support