What is a computer assisted method for the recording and analyzing of existing or hypothetical systems?

First Of All Make Your Computer Administrator And Make Parental Controls To Other Partitions Then Use Wireshark Software For Traffic Control

Check the log system files 

A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system, modelling its process aspects. A DFD is often used as a preliminary step to create an overview of the system, which can later be elaborated

Use of a software application or program

it  is a data flow and data  communication techniques and save our memories and protect our files

it  is a data flow and data  communication techniques

a computer assisted method for the recording and analyzing of existing or hypothetical systems is a communication system in another word data communication .. 

a computer assisted method for the recording and analyzing of existing or hypothetical systems is data flow

Please clarify

Any hypothetical Systems

Example

PC hypothetical or what