How many times have you render a high-resolution image. This process may take several hours. If you do that with a GPU, you can forget any other work on your computer. But you can pause render process, do the job on the comp you wanted and then resume render process. Here is little trick how to do this.
Download the Process Explorer from this link:
Start Process Explorer and find blender.exe
Right click on blender.exe and click on “suspend”. Now the render process is paused. To continue the render process, press right button and click on “resume”.