Retransmission of results: whether to keep a history of result messages to enable lost results to be retransmitted, with re-executing the operations at the server.

A distributed system is a transparency system that means if one machine crashes, the systom as a whole can still survive.

In Invocation Semantics: At-Least-Once, the remote method may be executed once or not at all.

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.