Flat rate is common in broadband access to the Internet in the USA and many other countries. A charge tariff is a class of linear rate, different from the flat rate, where the user is charged by the uploads and downloads (data transfers).
MUI stands for Multilingual User Interface and .dll.mui files are simply libraries(Dlls) that contain resources dedicated to localization : for an application to support multiple languages,dlls containing specific resources must be available eg language resources(arabic,french,english,chinese....
Managing The Memory with Kernel32.DLL A 32-bit dynamic link library file in Windows 95, 98 and ME, the kernel32.dll file is responsible for memory management. All input/output operations and interrupts are handles by kernel32.dll.