This paper describes the design of a synchronous World Wide Web-based distance education environment developed at the Telematics Laboratory of Computer Engineer and Informatics Department (CEID) and Computer Technology Institute (Greece); the environment uses telematics services to conduct lessons over computer networks, simulating a traditional classroom environment with the live presence of a teacher, where all interactions among students, teacher, and courseware can be realized. Topics discussed include: the general architecture of the teletraining tool, including major advantages, specific advantages to trainees, and the selection of JAVA as the programming language; functionalities of the teletraining tool, including services provided by the teletraining server, the trainer's client, and the trainee's client; and the user interface of the trainer's and trainee's client. Two figures present the protocol stack and the user interface of the trainee's client. (AEF)