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Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.
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You can use sp_who to see who's connected:
EXECUTE sp_who
You can then identify from those results who is connected and then kill those processes using the KILL statement with the associated spid:
KILL <spid>