How to perform 'Parallel Check File Exists' in SAS.
* Task: Parallel Check File Exists
* Language: SAS
%macro parallel_check_file_exists()
* Implementation for Parallel Check File Exists
%let result = ...; * Initialize variable
* TODO: Implement core logic here
* Step 1: Prepare data
* Step 2: Process Parallel Check File Exists
%put("Done");
%mend;