### 1. How to change a user preference

A user preference is set or changed once for all by using the `-putpref` command-line option. Its syntax is: `-putpref `preference_key` `preference_value``. Example:

    w2x-app -putpref displayScaling 200

A user preference is removed, and thus the default behavior is restored, by using the `-delpref` command-line option. Its syntax is: `-delpref `preference_key``. Example:

    w2x-app -delpref displayScaling