File adapter instances for BPM processing

I have two doubts. If I have a single file adpater polling an Input folder and the reciever is the BPM,and i have multiple files in the same folder to be picked up by the File adapter. Will the files be qued up to be picked by the file adpter, or will there be a multiple instances of the file adapter internally ?

The second issue is that, if i have multiple instances of BPM using the same outbound file adpater, then will the outbound messages be qued up or sent parallely

Please share any ideas on this.

Regards