How Extella is built

06 / How the environment is builtEach component has its own role

A program and its execution
are set up separately

CSPL separates a saved program from the handler that runs its commands. A window and an agent are two different ways to call that program.

Program: Code that is saved and called by name.
Agent: Finds, creates and calls programs through the tools available to it.
Language and handler: The program names its language. The handler defines how its commands run.
Device: A machine with the executor (Listener), languages and dependencies set up.
Desktop: Windows and apps through which a person works with programs.
Store: Publishing an app so that another person can install it. They get a separate copy.

How a program runs in Extella

Call diagram

Program

ledger

01 add 5
02 add 7
03 sub 2

Code and language

A program is stored under a name. Its record names the language it is written in.

Device

ledger handler

add nadd n

sub nsubtract n

Language handler

On the chosen device, separate code reads the program's commands and runs them.

Result

total105 + 7 − 2

Program response

The result goes to whoever called the program: an app, an agent or other code.

The call and the response pass through the Extella service. The ledger calculation is broken down below: the program, two handler versions and the call record.

CSPL / Technical checkCSPL · experiment of 2 October 2026

The handler can change
while the program stays the same

CSPL separates a saved program from the code that runs its commands on a device. In this experiment the handler was changed, and the four programs were not saved again.

One of the four programs · ledger

The program text stays the same

add 5
add 7
sub 2

Handler version

total: 10

Sum: 5 + 7 − 2 = 10.

Responses from the call record of 2 October 2026.

What the experiment showed

After the handler was replaced, the sums stayed the same and the responses gained extra fields. In this example, execution changes while the program text does not.

Limits of the conclusion

We tested a two-command language and four programs. This does not prove compatibility for any code, a speed-up, or protective isolation. The response format and dependencies need to be checked separately.

Call record · JSON ↗CSPL technical write-up ↗