How to run than two R modules at the same time

I like two have two R modules running at the same time.

To achieve this i use R and Rstudio

this means I can run code through R while running other code through Rstudio.

What if I want three windows at the same time, but wanting to run all the same version of R (pumpkin helmet)? Now R does not provide 62-bit and 32-bit versions, I can't use these two plus Rstudio.

RKward does not seem like useful option.