I have an app which allows the user to switch display resolution. On NT I get the display frequencies available for a particular resolution and allow the user to pick which one to use. On one particular machine (DELL 486 with Cyrix video card running NT 4) one of the avilable frequencies returned by EnumDisplaySettings() is a frequency of 1 Hz! Is this the default hardware setting? Should I treat settings below, say 20 as default frequencies?