In some environment, it's not convenient to navigate to preference page to change user preferences. Strategy Web URL API enables to change preferences by URLs for certain preference settings. This is an example to change the Maximum rows in grid from 200 to 1000:

http://server/MicroStrategy/asp/Main.aspx? evt=25003&src=Main.aspx.prefs.preferences.25003 &level=user_project &maxRow=1000