Final answer:
The 'Split screen' method allows you to work on a Word document and an Excel document at the same time by dividing your computer screen.
Step-by-step explanation:
The method that allows you to work in a Word document and an Excel document simultaneously is Split screen. This feature lets you divide your computer screen so that two different programs can be viewed and worked on at the same time. To do this, you can either drag the window of one program to the side of the screen until it snaps into place or use the 'Split' feature within the programs themselves. Other options like Copy-paste are used for transferring data, Multitasking refers to the capability of a processor to handle multiple tasks at once, and Parallel processing is a term that describes the simultaneous processing of the same task across multiple processors to speed up computing tasks.