The following message for a Distribution object is available only in JSL. The message creates an array of handles to the fitted distributions, so you can send commands to specific distributions:
dist_object << ( Fit Handle[n] << ...);
You can also get a reference to a fitted distribution directly if you send the Fit Distribution message to a Distribution object. This enables you to send commands to specific distributions:
fit_object = dist_object << Fit Distribution( distribution_name );
fit_object << ...;