The pictureRef macro includes a picture in a web page or template. It has lots of optional parameters, which allow you to specify the alignment, change the height and width, set the size of the border, and so on. If you specify only this first parameter, you get the same effect as just typing the shortcut name in double quotes.
Explanation is the alt text.
It's the amount of border around the picture if the image is enclosed in a link. If you don't specify the height, the actual height of the picture will be used. If you don't specify the width, the actual width of the picture will be used. This macro is new in Frontier 6.2. Frontier users may recognize this macro.