How to Change IPTC Data for Multiple Files

[bmrider]

Is there a way to change the IPTC data in a particular field (e.g. Country) for a group of image files rather than doing it individually using the 'Edit IPTC-IIM/XMP' window?

[xnview]

you can use Edit IPTC to change a batch of files

[bmrider]

Thanks for this information. I was not sure how the 'Save All' button worked but now I understand.
Clicking 'Save All' in the Edit IPTC window seems to add information to a field for several files if the fields are empty but I can't seem to get it to change the fields for several files if they already contain an entry.
Am I doing something wrong??

[xnview]

you need to clean fields before 'clear all', enter your fields and write all