Problems with inline feature

[Ronald Lieuw-Sjong]

Hi mapserver list,
I have installed mapdemo and trying to 'learn' and understand the proper
syntax.
Right now I am having problems understanding the following code from the
demo.html file:

 <td align="center"><input NAME="img" TYPE="image" SRC="[img]" width="600"
height="600"><p><img src="[scalebar]"> </td>

specifically the SRC="[img]"  and src="[scalebar]" 
I understand from browsing the archives that the [img] will be replaced by
this:

http://128.101.73.80/cgi-bin/mapserv.exe?imgxy=299.5+299.5&imgext=477610.519
153+4969319.036682+505753.480847+4997508.307318&
map=c%3A%5Cinetpub%5Cwwwroot%5Cms_demo%5Cdemo.map&mode=browse&layer=lakes&la
yer=streams&zoomdir=0&zoomsize=2&img.x=283&img.y=222

Can some explain me the above or point me to an archive explaining this
more in depth.
TIA
Ronald Lieuw-Sjong
Curacao, Neth. Antilles

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