Notifications subscription

Hello,

I'm using EMGC 10g on a windows box.

After a few years of use, a few DBAs have passed here, each one had its own user on the grid, and each one had subscribed to some notifications or n ot.

So is there a way to query mgmt tables or views in the GRID Db to list all the existing subscriptions  and to remove the unused ones ? 

I could remove users in grid too, but as many of them where declared as superadminstrators i'm not sur it would not invalidate things they are associated with.

Best regards,

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BG