Sometimes you might want to find out how many times a particular word is used in a document. You can use the Find/Replace dialog for this (CtrlF). In the "Find what" box, type the desired word or phrase. Also make sure that the "Whole words" box is checked:
Press the "Find & Select All" button:
Atlantis will select all found instances in the document window and will display a message specifying how often the search word is used in the document:
In the same way you could find out how many particular phrases or even separate letters or punctuation signs have been used in the document.
Now you might want to restrict the count, hence the search to a specific portion of document. This is done by selecting the document portion before pressing CtrlF.