I wonder if the limitation ones from a session I'd issue.  My first session is 
'A'; second is 'B'.  I wonder what happens after 26 sessions?

Sent from my iPhone

On Jul 17, 2013, at 11:52 AM, "Joel C. Ewing" <[email protected]> wrote:

> On 07/17/2013 04:26 AM, Alex Wang wrote:
>> Hey, there.
>> 
>> I'm curious about is it possible to open about 50 PCOMM sessions on one PC?
>> 
>> Because I just want to test how many TSO user IDs which could logon the 
>> system at the same time. 
>> So I started PCOMM sessions and logon them using different TSO user ID one 
>> by one. The maximum number of sessions is 25. Because the PCOMM told me 'no 
>> more sessions could be started' until I have had 25. 
>> 
>> Is there any one who did such test before? It seems we couldn't start as 
>> many sessions as we want on one PC. :-)
>> 
>> Note:
>> 1. This is the default definition in our SYS1.PARMLIB(IEASYSXX)
>> MAXUSER=500 
>> But one of the SP told me the system is running as a z/VM guest machine ID 
>> and the allocated resources is limited. So she afraid that it could not 
>> afford 50+ people on the system at the same time. 
>> 2. I'm using PCOMM Version 5.7 for windows and the OS i'm using is Win7. 
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> MAXUSER is for all address spaces in the system.  The specific max
> number of these address spaces that TSO can use is further limited by
> USERMAX value in  PARMLIB(TSOKEY00), and the way the VTAM TSO
> application node is defined to VTAM must also allow for enough distinct
> session names to support the TSO USERMAX, or VTAM will become the
> limiting factor.  Of course if on a machine with limited resources, real
> memory, page dataset sizes, CPU could all impose their own limits, or
> the logon might be allowed but response could just go to the dogs.  A
> logged-on TSO session that isn't doing anything obviously requires much
> less resource than an active user.
> 
> I can believe that PCOMM might have licensing or design restrictions
> that impose session limits unless you pay more.  You could either try
> using multiple workstations, or look for some alternative TN3270
> application.
> 
> If you have access to a Linux workstation, try free open-software X3270
> for TN3270 support -- definitely no licensing limits on number of
> sessions there.  For that matter I think you can even run X3270 under
> Windows under the cygwin UNIX environment, although it's been a long
> time since I tried it.  I have recently used cyqwin under Windows 7
> systems, but not for X3270.
> 
> -- 
> Joel C. Ewing,    Bentonville, AR       [email protected]    
> 
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