HKLM\SYSTEM\CurrentControlSet\Services\AtmUni\Parameters\
The Adapters subkey of AtmUni\Parameters stores ATM configuration data that applies only to a particular adapter. (Entries that apply to all adapters appear in the AtmUni\Parameters subkey.) This subkey enables you to configure individual adapters independently.
The Adapters subkey contains one or more subkeys, each of which represents a particular ATM network adapter and is named by the GUID of that adapter. Each of these <Adapter-GUID> subkeys stores entries that apply only to the adapter represented by the subkey.
Some entries can appear in the AtmUni\Parameters subkey and in an <Adapter-GUID> subkey. If the entry appears in both locations, the value in the <Adapter-GUID> subkey takes preference over the value in the AtmUni\Parameters subkey when configuring that particular adapter.