Complex sentence: The user can select a number of thumbnails to perform Copy/Move/Delete operations on them, or send them to IrfanView's Batch Processing module or an external program such as Adobe Photoshop.
Split into simpler sentences: The user can select any number of thumbnails to perform the usual Copy/Move/Delete operations on them. Selected thumbnails can also be sent directly to IrfanView's Batch Processing module or opened with an external program such as Adobe Photoshop.