SQL return after running sp_who2

After I running the sp_who2, i fould the some returns which i have dont know,
SPID  Status                    DBName        Command
----------------------------------------------------------------------
 1     sleeping                   master           SIGNAL HANDLER
 2     BACKGROUND        master           LOCK MONITOR
 3     BACKGROUND        master          LAZY WRITER
 4     sleeping                   master          LOG WRITER
 5     sleeping                   master          CHECKPOINT SLEEP

Can anyone explain to me what is that talking about? Thanks
shyline777Asked:
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FDzjubaCommented:
its just some data from the server of the current activity of the server, what exactly do you want to know about it ?
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FDzjubaCommented:
sp_who returns a result set with the following information.

Column Data type Description
spid smallint The system process ID.  
ecid smallint The execution context ID of a given thread associated with a specific SPID.
ECID = {0, 1, 2, 3, ...n}, where 0 always represents the main or parent thread, and {1, 2, 3, ...n} represent the sub-threads.
 
status nchar(30) The process status.
loginame nchar(128) The login name associated with the particular process.
hostname nchar(128) The host or computer name for each process.
blk char(5) The system process ID for the blocking process, if one exists. Otherwise, this column is zero.
When a transaction associated with a given spid is blocked by an orphan distributed transaction, this column will return a '-2' for the blocking orphan transaction.
 
dbname nchar(128) The database used by the process.
cmd nchar(16) The SQL Server command (Transact-SQL statement, SQL Server internal engine process, and so on) executing for the process.

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