An ability to activate/deactivate an alarm is a very useful feature of WakeMeUp!
To activate an alarm you should select the alarm you want to activate in alarm list, then click on its checkbox. Alarm is activated when the checkbox is checked.
Click column header to activate/deactivate all alarms at once. You can use the <SPACE> button instead of clicking a checkbox.
An alarm can be created deactivated, although it is active by default.
