FTP Adapter with Runtime OS Command before Message Processing

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Hi PI Techies,

I have a confusion in using Sender FTP Adapter with Runtime OS Command before Message Processing.

Scenario is like this:

Ftp Adapter has to pick a file from FTP server after it checks that a Blank Marker file exists on PI server AL11 directory say "tmp directory".

For this I am using Runtime OS Command before Message Processing where a shell script will check the existence of Blank Marker file on PI server AL11 and if found , it exits the script and FTP Adpater will then pick the Actual Data File and Process it.

Now Confusion:

I am confused in technical execution of steps by FTP Adapter..

Whether FTP Adapter polling initiates the Interface or Runtime OS command checking the File existence will initiate the Interface?

May be its follish to you guys... but please answer ..

Regards,

Anurag