Magistrinio darbo projektinėje dalyje buvo sukurta nuotolinė žinių testavimo sistema „Cool Test Tool“. Ji realizuota remiantis kliento – serverio architektūra. Projektavimo metu buvo pasirinkta „Remote Objects“ technologija su TCP protokolu. Todėl šio darbo tikslas – išanalizuoti CORBA, Remote Objects ir Web Services veikimo principus, ištirti jų resursų išnaudojimą ir išrinkti efektyviausią technologiją, tinkančią projektui. Šios technologijos pasirinktos todėl, kad jas paprasta pritaikyti esamam projektui. / Many of today’s enterprise computing systems are powered by distributed object middleware. Such systems, which are common in industries such as telecommunications, finance, manufacturing, and government, often support applications that are critical to particular business operations. Because of this, distributed object middleware is often held to stringent performance, reliability, and availability requirements. Fortunately, modern approaches have no problem meeting or exceeding these requirements. The goal of this research was to familiarize with middleware technology especially with CORBA, Microsoft .NET Remoting and Microsoft .NET Web Services. In experimental part was proved that the most efficient technology is Microsoft .NET Remoting with TCP protocol. That means our choice was correct during development of our project “Cool Test Tool”.