In this paper we present an on-line learning system, its architecture and basic functions, as well as the main approaches how to teach remotely. Our learning system provides an effective and natural human-computer interface. This program has been successfully used to teach a programming course, showing a number of advantages and benefits in comparison to the traditional teaching methods. We demonstrate how rewarding it is to create teaching tools that use a variety of modern methods of human-computer interaction, such as speech recognition. Finally, we compare the existing systems of remote teaching.