How to work with the application on a computer through the site?

Question

Web development

I want to understand how such sites work:
For example, a person uploads a photo to the site, and a photo processed with some kind of filter in Photoshop is returned to him.
Or I wanted to make a site where a person can enter a phone number, and SMS Bomber on the server or on my computer would receive this number and carry out the attack.
I understand that perhaps I misunderstand and describe everything, but I think you understand the essence.
What needs to be learned, how does it all work?

Answer 1

For example, a person uploads a photo to a site, and a photo processed with some kind of filter in Photoshop is returned to him.

Is it necessary in Photoshop? I'm not sure that Photoshop has an api for working with it, well, you can create a filter through some sort of image manipulation.

Or I wanted to make a site where a person can enter a phone number, and SMS Bomber on the server or on my computer would receive this number and carry out the attack.

If your "SMS Bomber" is supposed to be launched with a number parameter, then why not. We get the number and the server starts our "SMS Bomber" by transmitting the number.
You need to study programming languages, works in programming languages. Almost anyone can learn Java, C #, C ++, Javascript, PHP on anything you can do it.

Answer 2

If you want trash, study the command line arguments
https://community.adobe.com/t5/photoshop/using-pho...
This is purely for Photoshop.
But in my opinion this is a road to nowhere. It is easier, more reliable and faster to use libraries and handle everything in the application. However, the approach with COM objects takes place, for example, when starting Excel and some manipulations with the book. But this creates a load on the server and is difficult to debug. Yes, memory can leak.

Answer 3

Such sites do not work with applications, but with special libraries