In space coupling, a sender can send a message but not known to whom it is sending nor if more than one, if anyone, will receive the message.

A parallel database Oracle is an example of Mobile code.

The security of a DS can be achieved by only securing the processes and channels.

DS is used (a history of results) for error control mechanisms.

In space uncoupling a sender can send a message even if the receiver is still not available.

The information Society is an example of DS network.

In Invocation Semantics: Maybe, the remote method may be executed once or not at all.

Networks focuses on packets, etc., whereas distributed systems focus to applications and routing

Timing failures a process may omit to respond now and then.

Networks like distributed systems focus un packets and routing

Arbitrary failures a process may halt or perform "faicity" stepe

In Invocation Semantics: Maybe, the remote method may be executed once or not at all.

A distribused system is a colloction of independent computers that appear to the users of the systeem as computers, and communicate together only by message patsing

Data Marshalling means flattening a data structure

The Mebile agents could be used for Software maintenuice

In Mobile code placement the client interacts with the applet.

Interprocess communication works in Middleware layers.

All DS components communicate using distributed shard memory

The Scalability is limited in Publish-subscribe systems.

Synchronous Send and Synchronous receive in (IPC) The Sender need acknowledgement

...................able to interoperate, Different hardware, different software, different protocols.