"What types of resource contention issues can occur when fast user switching is enabled?"
"Resource contention occurs when fast user switching is enabled and a user tries to access an item that another user has open in the background. Document contention occurs when a user attempts to open a document that another user has already opened. Peripheral contention occurs when a user attempts to access a peripheral that's already in use by another user's open application. Application contention occurs when the second user attempts to access an application that's designed to run only once on a system."