MKR stands for Moduł Klienta Raben which is Raben logistic company customer client-server application.
It's still being used (over 3000 client installations). MKR is mostly used for creating shipment orders for Raben and printing logistics documents. There are also features like Track&Trace shipment and print stickers.
It's a desktop application running under Windows.
It was first written in Delphi 7 and than ported to Delphi 2007.