Yes, this helps, I did not understand that psh was a debugging tool. About 
(app), I still would like to know, if there was a way to run more than one 
application on the same computer and be sure that they would not by accident 
decide to use the same port. I understand that within one app there is no 
problem (as long as there are not too many users), but with two or more? Or do 
my network programming memories need a refresh? 

> From: 
> To: 
> Subject: Re: questions about the gui 
> Date: Sat, 21 Nov 2015 08:51:43 +0100 
> Hello, 
> It is a local shell that connects to a local webserver. 
> It can be used for webdevelopment, you can expect variables and so on. 
> (app) open a new process with a new port. So each process and each 
> single user linked to it can has a own state. The user can connects to 
> his new port 
> Does it help? 
> Am 21.11.2015 08:28 schrieb "Denis Fourt" 
> <<>>: 
> Hello, 
> After reading the gui documentation, I would like some help on the 
> following topics, please : 
> a) I am not sure to understand the purpose and the uses of the psh function 

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