Batch editing of images

I have several images of products and I need to add a disclaimer at the bottom of the image. Is there a way to do a batch process or script?

.bat command line parameters is what I am after. Is there a tutorial or how to that I can look up?

Thank you, Thomas, for reminding me of these resources! I did not update the command line parameters in a long time, and added some in the meantime. One such parameter that is not described there is -stamp followed by the stamp name. So the complete command line to stamp image could be like this:
 
hprsnap8 -open C:\MySnaps\snap1.png -stamp StampName -save C:\MySnaps\stamped\snap1.png -exit
 
It would stamp and save the image without showing any window. Don't forget to enclose in double-quotes if any names contain spaces... if hprsnap8.exe is not in your system PATH, then you would need to use the full path\filename for it.
 
The simplest way to apply to group of files, under Windows Command Prompt: Enter the directory with saved files (C:\MySnaps in the example above, and "stamped" sub-directory created), then execute:
 
for %f in (*.png) do hprsnap8 -open "%f" -stamp StampName -save "stamped\%f" -exit
 
Greg