why documentum webtop is shiped with java windows jre

I found 2 big files in documentum webtop

 webtop\wdk\contentXfer\win-jre1.6.0_16.zip
 webtop\wdk\contentXfer\win-jre1.5.0_06.zip

Why webtop is shipped with it?

If all your users have java on their PCs then you can delete the JREs packaged with webtop. I have done this before. Also I stripped out other files not used. For example:

• the help files (not used as client did their own help)
• Delete Sources and Web Workflow manager
• Remove Themes

• Remove UCF Jars and JRE

  Make sure to check the runtime java version setting in: "wdk/contentXfer/ucf.installer.config.xml"

  Your PC clients must have at least this version of java installed. This is from Webtop 6.7