Modem Parameter "UserInit" change in Registry ?

i need a solution to change/add the registry-key "UserInit" from any Modem.

i can read with rasenum the names of the installed modems, now i must find all entrys from this modems in the registry, where i can add/change the parameter "userinit" .


i have one idea - i search in all Classes of HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Class for a String "Friendlyname" = Modemname .... but i don't know, how i can search in the registry ...


can anyone help ?