CALL--Notes

Using batch-parameters

Batch-parameters can contain any information that you can pass to a batch
program, including switches, filenames, the replaceable parameters %1
through %9, and environment variables such as %baud%.

Using pipes and redirection symbols

Do not use pipes ("|") and redirection symbols ("<<","<",">", and ">>") with
the CALL command.

Making a recursive call

You can create a batch program that calls itself; however, you must provide
an exit command. Otherwise, the parent and child batch programs can loop
endlessly.