>I ma not a native English speaker. However, I have to use English to do reading, thinking and a lot writing. After years working in the computer tech World, I still cannot tell what is the difference between the words 'System' and 'Systems' in cases such as:
>
>Operating System v Operating Systems
>Database System v Database Systems
>System Analist v Systems Analist
>...
>
>I would appreciate anyone who cares to offer an English lesson.
>
>Chen


In each case, the first one is single, or one OS, DS, SA. The second one is multiple. For example, 2 or more Operating Systems (NT, Windows 95). The same for DA & SA.