If the receiving device has holographic elements, it should implement the following:

1. Maintain a list of holo-blockers. This is a collection of keys that are preventing ("blocking") the holographic elements from being shown.
   
2. Check the list of holo-blockers in a timer and whenever the unit is powered on. Keys stay on this list while they are either:
   
   1. the OBJECT_ROOT of the unit (i.e., its chair), or
      
   2. in the attachment list of the unit.
      
3. When the list of holo-blockers is empty, the holographic elements can be shown again, and it is no longer necessary to periodically check the list. Remember to ensure that holographic elements are not visible while the unit is powered down.

The block-holo message should be sent by containers and equipment that tightly enclose the avatar, such as packing crates and power armor.