You can keep as many diaries as you wish and open them as you would open any other document.
To open the diary, go to File menu and click Open.
All the diaries are kept in directory C:\ADI-diary 2010\Data
The name of the folder represents the name of the diary, which appears in the Open Diary dialogue box.
Select the name of your diary and click OK.
To change the location where your diaries are kept, go to Server menu and click Settings