The SSS-CORE is an general-purpose operating system for network of
workstations (NOW) and distributed-memory multiprocessors.
By kernel/user cooperations, 
the OS realize the multi-user/multi-job environment in which
user applications is executed efficiently in parallel.
In parallel systems, overhead caused by
user-level inter-processor synchronization and communication
is the biggest impediment to efficient execution
of parallel programs.  
Therefore, user-level high-speed synchronization and communication
are key techniques even in the SSS-CORE system.
The SSS-CORE system presents
memory-based communication and/or synchronization facilies
whose consepts were proposed in Strategic Memory System (SMS)
using Memory-Based Processors (MBP).
These facilies in the SSS-CORE are implemented whithout special
communicatin-dedicated/synchronization-dedicated hardware like MBPs. 
In this paper, memory-based communication and/or synchronization
facilies of the SSS-CORE system in NOW are briefly introduced with
discussions on convetional problems and its solutions in the
SSS-CORE.