Guides can, for example, set fixed lines of rope for others to use, organize rescues in times of trouble, or use communication tools to call in helicopter evacuations. Another job on Mount Everest is as an icefall doctor using ladders and ropes to make a path across the Khumbu Icefall, which guides might do themselves or delegate to others. Guides, especially if they are guiding for a mountaineering or adventure company, often call the people they help up clients.