[Click here to download example files ] Microsoft Visio is an amazing package for drawing diagrams, especially technical ones. For example if we have a diagram which shows the main devices used for network security:

The diagram can then be copied and pasted into PowerPoint, such as:
It is also possible to export the files from Visio to PNG, and then import into Macromedia:
The diagrams are then:

and then, if we have to illustrate the movement of the servers to a DMZ (de-militarized zone), we can have:
and:

and:
