Advanced Customization > Info*Engine User’s Guide > Custom Webjects > Required Attributes for Custom Webjects
  
Required Attributes for Custom Webjects
The following attributes and attribute values must be included when you call custom display and group webjects:
Attribute
Description
TYPE=EXT
Indicates that a user-defined class is to be used.
USE=ClassName
Identifies the user-defined class (including the package) in which the method implementing the webject resides.