More than i expected.  thank you for all the sites and info.

The information really helped.

Excellent and concise and provided me with a well-reasoned answer.
This worked just as I has hoped it would.

Despite the fact I spelled Khan wrong, nice find.

jaq,

You did a lot more work than I expected for $4. Thanks.  

I'm not sure how much confidence I can place in your sample.  

To summarize your results:

o Virtually no CS program requires a course in web-based systems.
o We don't know about Operating System requirements 10 years ago.
o Regarding Operating System course requirements now in BS programs:

    Duke: yes
    Tennessee Tech: yes
    CSU-SanJose: yes
    UCSD: no
    BU: no
    UWash: no

So about 50% of BS degree programs in the sample require a course in
operating systems.  (I didn't count the lower division BU course.)

I wasn't expecting much of an answer to such an open-ended question.
However all the information I got back was very helpful. Thanks.

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A thoughtful and helpful answer.  Thanks!

Hoorah, an answer!  This question has been driving me crazy!  I did suspect that it was unresearchable and would require someone already having 
knowledge of the series.  Thank you for this well-written, friendly answer.