Objective mode
Objective mode was a holodeck setting which allowed users to observe characters and events in the program without interacting with the holographic environment. When objective mode was activated, holodeck characters would not take notice of the user, and the user could pass through solid objects, such as doors and bulkheads. This was the opposite of subjective mode.

In 2370, while running an historic holoprogram on the  depicting the final voyage of , Commander Riker used the objective mode feature to observe interactions among the characters when not taking on the role of an Enterprise crewman. ()

See also 
 Subjective mode
Holographic technology