The /delete option is used to tell V to delete the file once it has finished viewing it.
This option may be necessary if you are using V as an external file viewer. When using external file viewers, programs usually create temporary files and then launch the file viewer to display the temporary file. It is up to the program that launches the file viewer to delete any temporary files it has created.
However, not all programs are well behaved and it is sometimes not possible to delete the file because V may still have the file open. If you know that the program in question always creates temporary files before it passes them to V, you should use the /delete flag.
*** Please use this option with caution ***