Automate calling a concurrent program when reach record count limit

Hi all,

I have a request from user, they have a concurrent program that outputs a piped delimited textfile to browser. When the output returns over 500k, the browser sometimes crashes. User would like to limit the output to 500k records and call the program again until output is reached. For example if output is 760k records, the concurrent program should end at 500K records and start again at record 500,001 to 760K records, which is the remainder 260k records. How should I develop the For Loop for this?