The cancel functions allow for the cancelling of the specified object (similar to the kill command in SQL Server). You can use the various discover functions to get a list of currently active sessions or connections.
CancelConnection(connectionID) Cancels the specified Connection based on its connection id.
CancelSPID(SPID) Cancels the specified SPID
CancelSession(sessionGuid) Cancels the session for the specified session GUID