The document provides instructions for zipping multiple files on Windows 7 or Vista computers in 4 steps: dragging to select multiple files, holding control to select specific files, right clicking and selecting "Compressed (zipped) folder" from the menu, and compressing the files into a single zipped file. It notes that zipping compresses files into a single file, allowing multiple files to be emailed or submitted as one file where limited. The process does not actually reduce file sizes but changes the file format.