Definitions of walk-through:

• noun:   the act of walking in order to view something

  Example: "The realtor took her on a walk-through of the apartment"

• noun:   a first perfunctory rehearsal of a theatrical production in which actors read their lines from the script and move as directed
• noun:   a pedestrian passageway through the ground floor of a building
• noun:   a thorough explanation (usually accompanied by a demonstration) of each step in a procedure or process

  Example: "She gave me a walk-through of my new duties"