Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Announce Service to Local Network
PREFS_SERVICEParameter: Allow Sharing of MyMaxon Username
PREFS_SHAREUSERNAMEParameter: Download Folder
PREFS_FOLDERParameter: Reset to Default Folder
PREFS_RESET_DEFAULT_FOLDER