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3270 screens

 
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Hi,
Can someone explain briefly what ' a cobol legacy system accessing a database through 3270 screens' mean ? I have never worked with mainframes or a legacy application before and it is difficult for me to visualize this.
From what I have googled, I know 3270 screens are the terminals for the IBM mainframe. So does this mean the Cobol application is hosted on the mainframe ? Or is it the database on the mainframe ? Or is is simply a Cobol application accessing the database .. in that case where do the 3270 screens come into play ?
I have no problems in understanding the Java part of things, but I'm confused as to legacy (ad hoc) what is where. Any info is appreciated.

Thanks,
Hemant.
 
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Well Goan,

The 3270 are, what we call, dumb terminals, they just show the output of a program running in the mainframe.
The Cobol System, the Database and the screens all run inside the mainframe.

It is clear now?

Regards,
 
Goan Balchao
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Not exactly, I'm still googling many of those terms and their usage but thanks.. it helps to clarify the environment.
One more quick Q. Is it correct that the communication between the 3270 screens and the mainframe occurs in a protocol-specific manner (data streams? ) ?
 
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From what I can remember 3270 screens and the Mainframe OS (s/390 etc.) communicate using a VTAM connection. Reading the data from these types of data streams form the basis for some screen scrapper solutions.

HTH
Tom
 
Don't get me started about those stupid light bulbs.
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