adminpermissions in administrator table

[Tryfwar]

How exactly do the 'adminpermissions' codes in the administrator table work?

I mean, is there some form of lookup table or what?

i basicly need to know this as i have created a seperate admin page with just the nav menus for editing Users, but when i set a group to become an admin, they get assigned 256. This then gives them a wide assortment of functions i don't want them to have if/when they switch over to the main admincp page.

Thanks to anyone who can help out or sugest a better way of managing how to assign just the ability to edit user's details only.