SessionGracePeriode in atipical situation

Document ID : KB000098228
Last Modified Date : 06/06/2018
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Issue:
I'd like to know :

Which ACO is chosen to set the session grace periode ?

Where can I find the documentation about this ?
Resolution:
As per documentation, the Web Agent protecting Application B is
expected to refresh the SMSESSION cookie each 3480 seconds when you
define IdleTimeout to 3600 and the SessionGracePeriod is set to 60
seconds.

IdleTimeout - (SessionGracePeriod * 2) 

Web Agent App A : 3600 - (30 * 2) = 3540 seconds 
Web Agent App B : 3600 - (60 * 2) = 3480 seconds 

Session Grace Period and Update Period Settings
https://docops.ca.com/ca-single-sign-on/12-52-sp1/en/configuring/web-agent-configuration/session-protection/session-grace-period-and-update-period-settings