IWCGJQImage.Picture.UserCache

Hello,
What is the purpose/impact of the IWCGJQImage.Picture.UserCache property?
Same goes for IWCGJQImage.Picture.CacheName, please?
Also, when I set IWCGJQImage.Picture.URL to 'images/header.png' should I see the image at design-time? It renders correctly at run-time.
Thanks, Rick.
What is the purpose/impact of the IWCGJQImage.Picture.UserCache property?
Same goes for IWCGJQImage.Picture.CacheName, please?
Also, when I set IWCGJQImage.Picture.URL to 'images/header.png' should I see the image at design-time? It renders correctly at run-time.
Thanks, Rick.