Version 8 by default uses graphic image instead of text notification, used in previous versions. To replace an image or edit it, please open the following file:
C:\Program Files\Net Control 2\locked.jpg
in any graphic editor, for example Windows Paint, edit it and save using the path above.

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For versions 7.xx or below:

The text of this message may be changed remotely from Administrator computer or manually on each user computer:

1. On User computer:

• click  icon in the System Tray;
• click menu command "Configure"

or

2. Remotely, on Administrator computer:

• select user computers,
• apply menu command N -> Options -> Remote Computer Options;
• configure all necessary settings (not configured settings will be reset to defaults);

3. on "Custom Text Messages" tab, edit the text in "Computer is locked" field;
click OK button.