This is a built-in feature of the Access Gateway Service. See the LAG /
AGS feature comparison table in the docs:
Install Guide | Installation Requirements | Access Gateway
Requirements | 3.6.5 Access Gateway Feature Comparison | Table 3.1 |
"Manipulates cookies so that when a browser retains application cookies
from the Web servers after a user logs out, these cookies become

Also at this link directly to the table:
'Novell Doc: Novell Access Manager 3.1 SP4 Installation Guide - Access
Gateway Requirements'

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