The program creates a custom xinput1_3.dll file (in v3) or acts as a virtual driver (in v4) that intercepts game input commands.
Go to the [Controller #] tab, select settings, and assign your controller's buttons/axes to the virtual Xbox controller mapping. Toca Edit Xbox 360 Controller Emulator
You can combine multiple input devices into one virtual 360 controller using the [Advanced] tab settings (Set "Combine Into" to "One"). The program creates a custom xinput1_3