This paper treats the e-learning domain from the virtual and remote laboratories point of view. These laboratories have Java applets as client side application. The paper presents the importance of offering to students the possibility to do laboratory tests with real data. Although a remote experiment can not provide the student with the real feedback of the experiment, by using real data and a good representation of the laboratory equipment, we can get closer the the real feedback. The article describes the facilities offered by the Java language in making user interfaces for the remote and virtual laboratories. At the same time, we present three implementations in the pilot project "Virtual Elec-troLab" of the "Leonardo da Vinci" program that have user interfaces based on the Java Applet technology, for accessing the laboratory resources via Internet.1 Introduction

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When it comes about accessing an application remotely, that is from another computer than that where the application resides, the security should always be of concern. Because the connection between the two computers is done through a physical space, on which we may not have any control, whether that connection is through wires or wireless, we must be on guard of any possible identity and information stealing. This paper deals with the security aspect encountered in any remotely communication between two or more computers, connected among them through a physical or wireless connection. It explains the theoretical base and the implementation of these aspects in "Virtual Electro Lab". 2 AUTHENTICATION Any communication is realized between two or more subjects. Each of them must identify itself to the others, in brief or in details, before being able to participate to that communication. After that, a continuously switch between emitter and receptor roles takes place among the subjects. In our case we have a communication between the client computer which makes requests and two servers which respond: the LMS server and the VEL server.

This paper treats the database structure and the architecture of "Virtual ElectroLab". The "Virtual ElectroLab" makes use of a relational database (MS SQL). It is also covered the communication procedure between the client and server. The paper describes the database structure exemplified through the database diagram. The web-based experiments are executed in an asynchronous mode.