I use Telnet quite regularly (from the TSO command line) to get from one z/OS 
system to another. 

It doesn't matter that the system you are going from is referred to by you as a 
'host' - in this case, it's just another telnet client. 

All colours, PFkeys, ISPF screen displays, scrolling etc all work exactly as 
they do if you're using a telnet client from Windows or Unix or OS/2 or 
whatever - you wouldn't know the difference.

This is what Transparent Mode does. By default the z/OS telnet client opens in 
Transparent Mode - allowing all screen control characters and key function 
codes to pass between the remote server and the local client. Since it 
recognises 3270 datastreams, I would say that this makes it a TN3270 client.

The only key that is not passed through is the ATTN key. This 'breaks' 
transparent mode and reverts to linemode, enabling you to enter telnet control 
commands such as 'quit', for example. 

You can force z/OS telnet client to open in linemode by specifying that as an 
option on the initial command line. If you try to do that to a 3270 telnet 
server, you will get an error message (or should do anyway) informing you that 
transparent mode is required.

Brian


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