Official rule text
89.1 STEP 1—ACTIVATION: The active player must activate a “Technology” strategy card allow a player to research a system that does not contain one of their command tokens. technology. a To activate a system, the active player places a command 90.4 Any technology card that a player has not gained remains token from their tactic pool in that system. That system is in their technology deck. A player can look through their the active system. technology deck at any time. b Other players’ command tokens do not prevent a player from activating a system.
View official source
Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 89.1