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STA(1) (Spanning Tree Algorithm) See spanning tree protocol.
(2) (STAtion) A client device in an 802.11 (Wi-Fi) wireless network such as a computer, laptop or smartphone. The term STA is sometimes used for the access point (AP) as well, in which case a STA is any device communicating via the 802.11 protocol. See wireless LAN and access point.
(3) (Secure Ticket Authority) A session ticket that authorizes access to applications running under XenApp and to desktops under XenDesktop. See Citrix XenApp and Citrix XenDesktop.