Calling a TestComplete method from external application

Hello,

I have a TestComplete project with a python script, wich is testing an application (Application A).

 My plan is it, to call a function out of the TestComplete testing script from another C# application.

C# application (B)                                                     Python TestComplete script             Application A

push button in application A                 --->               pushButton()                --->                *button gets pushed*

Is there an elegant way to do this? Like some kind of Interprocess Communication.

I know that there is a REST API, but because both applications run on the same computer this would not be nice solution.

I hope you could understand my plan 😄

Greetings

Leon