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Eduardo FuerteFlag for Brazil

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How CICS deals with online user requests ?

Hi Experts !

Could you please resume how CICS deals with online user requests ?
I'd like only an overview (it doesn't need to be extensive)

Thanks in advance
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woolmilkporc
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>> All physical I/O is handled by CICS. <<

To make it clear: CICS itself is not an OS, so it's not capable of running standalone.
In fact, CICS relies on the z/OS or z/VSE supervisor (the "kernel" in Unix) to control it, so you can see it in turn as a subroutine of the "real" OS, which will also handle physical I/O on behalf of CICS.

(OK, left aside that z/OS could itself be a virtual guest OS of z/VM ...)




 
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ASKER

Hello

It looks a complex task.

I've read but I need to read more times (and reflect)  to catch the meaning accurately and then return here.

By the way your outline is pretty good

woolmilkporc's explanation is excellent.

I don't know what your background is, but to put it as simple as possible is CICS is an application server, simular to function as other application servers like: Tomcat, WebSpehere, JBoss, Glassfish, Weblogic, ASP, and so on.

The biggest difference between CICS and those other application servers is that CICS supports more programming languages (Cobol, Assembler, REXX, PL/I, C/C++, and Java just to name a few) and it supports both "smart clients" and dumb terminals.
Now it's up to me to deepen the concepts you've pointed ! but it's a very good beggining ....