I recently needed to use ColdFusion to determine some properties of the operating system. This is easily done with the following code:
<cfset sysObj = CreateObject("java","java.lang.System") />
<cfset tmpOSProps = sysObj.getProperty("os.name") />
The getProperty() method is used to access several of the system properties. The parameter sent is the key to the property you want to access. A list of keys can be found on Sun's web site.
It should be noted that if you are in a shared hosting environment, you may not be able to use the CreateObject() method. Thus, you will not be able to access the java objects.