Get the latest binary here. This demo is limited to 4 input files, but it's still useful for some things.
Read the manual here.
Get the binary for process which helps you learn how to use DOSTask in a non-destructive manner.
To purchase it, just pay me $5 via Paypal (credit cards accepted) to my e-mail address jeremy@decompiler.org and I'll email it to you.
DOSTask is (c) 2007 by Jeremy A.Smith.