Ways of changing code during runtime

[agent]

Hi,
here's an example:
i have an app running on a remote pc which is controlled by me from my pc, it can do stuff like delete file, copy file, but i accidently forgot to put in a move file code, so now i need to add code to an already compiled and working app.
I can send it a file which will contain the needed code, but how do i get the app to run it?

I could be mistaken or drunk, but...

Move = Copy + Delete


Copy the file to the new location, then delete the original.

Also, if the source and destination is the same partition, rename might work as well.