where to placed cactus.properties

[sheep]

hi
    I read some articles about cactus but i was confuse about "CLASSPATH" 
//--------------------------------------------------------------------------------------------
    
Cactus looks for this information in a file called cactus.properties, which 
must be placed somewhere in the CLASSPATH on the client side. 
//--------------------------------------------------------------------------------------------
here CLASSPATH means java classpath or some other place ? help me!!!!!!!