If the message access counters are turned on and the colors of the message titles aren't changing when the messages are read you should ask your administrator to update to Ceilidh version 2.00l or later. All updates to Ceilidh are available free of charge. Digest opens all the messages in the thread simultaneously, so they appear listed sequentially in the browser. The order that they appear is the same as that in the thread and the indentation is denoted by arrows. This is great for catching up on, or printing, an entire thread.
Ceilidh relies upon the browser to change the link color.
Since there is no facility to manipulate the browser's history list, there is no way for Ceilidh to change the link color on these messages. The option to prevent the display of these buttons to unauthorised users was added to version 2.00t. Ceilidh validates registered users either on the basis of a cookie stored on their browser or of their IP address stored on the server. This is probably more than anyone is ever going to write in a single message. However, it is possible that someone might paste more than this amount of text into the composition window.