Batch job for IDOC processing in 64 status

Hi experts ,

i want to know the name of Batch job for IDOC processing in 64 status.

I have configured the partner profiles as 'process immediatly'.

So with this configuration whenever an idoc comes in production it gets processed immediatly and automatically.

i want to know how they are getting processed automatically.

is there any job which looks for these idocs(in 64 status and process immediatly flag) and process it.

What is the trigger for thiese idocs processing???

Please guide me

thanks in advance

Anit gautam