Open_tran in sys.sysprocesses has unexpected count

I'm running SQL Server 2005 SP1 on WinXP SP2.

I'm running a query to look for open transactions or blocked transactions. The actual query I'm running registers as having 2 open transactions and I can't figure out why. It seems to have something to do with the temp table because I don't get the open transactions when there is no temp table. I could perhaps see why I might have 1 open transaction pertaining to the open temp table, but why 2. Here is the query and the data from sys.sysprocesses:

  IF object_id('tempdb.dbo.#MyProcesses','U') is not NULL
 BEGIN DROP table #MyProcesses; END
 
 DECLARE @MyVariable varchar(100)
  , @Mycmd nvarchar(1000)
  , @LoginTime int
  , @LastBatch int
  , @LastBatchFilter datetime
  , @LoginTimeFilter datetime;
 
 SELECT @MyVariable = '' , @LoginTime = -600 , @LastBatch = -145  ;
  
 SELECT @LastBatchFilter = DATEADD(mi,@LastBatch,Current_timestamp);
 SELECT @LoginTimeFilter = DATEADD(mi,@LoginTime,Current_timestamp);

 -- I've reduced the number of columns in my SELECT for this example
  SELECT b.[name] MyDB
 , a.spid
 , a.blocked
 , a.open_tran
 , RTRIM(a.program_name) program_name
 INTO #MyProcesses
 FROM sys.sysprocesses a
 JOIN sys.sysdatabases b on a.dbid = b.dbid
 WHERE (a.blocked = 1 or a.open_tran > 0);

Select * from #MyProcesses

MyDB spid  blocked  open_tran  program_name
master 56    0              2                 Microsoft SQL Server Management Studio - Query

Please educate me.

Thanks,

Paul