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  2. MIDRANGE-L
  3. April 2005

RE: Green-screen versus browser

On Tue, 26 Apr 2005, Walden H. Leverich wrote:

It is true that a 5250 client could be modified to send back any key at
all.


Wouldn't display management stop that? I would think (hope?) that the
workstation manager would see a F8, but it would "know" that F8 wasn't
valid and stop the request. Is that not the case?

Good question. To test I ran tn5250 using the trace option (which logs everything sent between the client and host) and pressed an invalid key. tn5250 sends the key as entered (so you don't actually have to modify anything). The iSeries responds that the function key is invalid. So the validation is done by the host, not the client. Client hacks won't get you anywhere.

James Rich

It's not the software that's free; it's you.
        - billyskank on Groklaw

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