Honeywell Thor VM3 User Manual page 237

802.11 Settings
Determines the method used for fast roaming:
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Thor VM3 with Microsoft Windows 7 or Windows Embedded Standard 7 User Guide
Enable Standard Pairwise Master key caching - When standard Pairwise Master Key
(PMK) is enabled, authentication can be skipped if the client has already
authenticated to the access point previously. A connection to a new access point uses
the 802.11x authentication process while a reconnect to the access point can skip
the authentication.
Enable OKC- Opportunistic Key Caching (OKC) allows a client to skip 802.11x
authentication when roaming to an access point under a controller based
infrastructure. After the client authenticates with one access point, it can roam to
others under the same controller by handshaking rather than authentication.
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