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Multithread EusLisp (MT-Eus) runs on the Solaris 2 operating system with one or more processors. Solaris's threads are units for allocating CPU in a traditional UNIX process, having shared memory and different contexts. The thread library provided by the Solaris OS allocates each thread to a single LWP (light weight process), which is a kernel resource. The Unix kernel schedules the allocation of LWPs to one or more physical CPUs based on thread priorities assigned to each thread. Fig.5 depicts the relations between threads, LWPs, and CPUs. Two major changes in the design of the contexts and the memory management of EusLisp have been made to upgrade it to multithread capabilities.