Since Domino 6, the "OnBehalf" security model allows the agents to run on behalf of the specified user, as long as the agent is signed by the identity that has rights to sign agents on behalf of someone else. The server has this right implicitly. When the design update happens for enabled agents, the agents are disabled and thus stop running. When enabled, this variable restores the earlier behavior of not storing the agent signer in OnBehalf, so the agents remain enabled when a design update occurs.
Valid Values are:
1 - Does not store agent signer in OnBehalf and keeps agents enabled
2 (default) - Force disabling of agents for design updates