Abstract: Embodiments herein describe using visual passwords to control access to secure information. When a user attempts to access the secure information, she can provide her username to an authentication agent which identifies the visual password corresponding to the received username and selects a first set of images that contains the visual password and a second set of images that does not. The first and second sets of images are then transmitted to a user device. The user device can display the first and second sets of images to the user who selects which images have the visual password. An indication of which images the user selected is then transmitted to the authentication engine which determines whether the user selected all the images in the first set and none of the images in the second set. If so, the user is granted access to the secure information.

Abstract: Forecasted drive unit dispatch is described. An inventory pod associated with a materials handling action is identified, and a first drive unit is requisitioned and dispatched to retrieve the inventory pod and return it to a materials handling station. Concurrently, the ongoing status of other materials handling actions are monitored over time. Based on the ongoing status, a timeframe for the completion of another materials handling action is determined. An inventory pod zone associated with the other materials handling action is identified, and a second drive unit is dispatched on a forecasted route toward the inventory pod zone based on the timeframe. Later, the second drive unit is redirected to a particular inventory pod within the inventory pod zone. The second drive unit arrives at the particular inventory pod in less time because it was dispatched on the forecasted route toward the inventory pod zone earlier.