[ALUG] screensaver - how?

Having moved from xfce to fvwm2 I now no longer seem to have a screensaver. xscreensaver is installed on my system but the manual pages don't make it clear how to actually run it. What's the 'normal' way of running it? -- Chris Green (chris@areti.co.uk) "Never ascribe to malice that which can be explained by incompetence."