Windows Threads?

Question

API

Tell me, please, is there a function in the windows API that allows you to inject code or DLl into another process. After the injection, a thread is created with this code, but who ends up calling the functions described in this code? After all, the program begins to be executed from the main function and then only subroutines with data located on the stack are called, they are later referred to by the command counter. How then are they launched to execute a function in the same DLL that we injected, if the process does not initially know about such functions?

Answer 1

This should help:
https://habrahabr.ru/post/73324/