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