How to use the client:
Step 1 Download it.
Step 2. Make sure you have JDK.
This link is to the most recent (1.6.0_23)
i will use it in this tutorial
https://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_Developer-Site/en_US/-/USD/ViewProductDetail-Start?ProductRef=jdk-6u23-oth-JPR@CDS-CDS_DeveloperOnce Client is downloaded. open the folder you downloaded it to. Right Click the file and hit extract to..(clients name)
once it is finished open the folder and go in to the next folder inside it.
find run.bat and rightclick it and hit edit.
where it says jdk1.6.*** put your version!
"C:\Program Files\Java\JDK1.6.0_23\bin\java.exe" -Xmx1000m -cp .;Theme.jar Gui 0 0 highmem members 32
"C:\Program Files (x86)\Java\JDK1.6.0_23\bin\java.exe" java -Xmx1000m -cp .;Theme.jar Gui 0 0 highmem members 32
it should be one or the other of these. depending if you are running a 32 or 64 bit processor.
if this doesnt help your on your own =[
edit: forgot jdk in the links :\