About the Ignore All List
When you spell check a document, and SDL Trados Studio finds a word it does not recognize, it displays the Spell Checker dialog box.
One of the options in that dialog box is Ignore all. When you select this option, Studio adds the term to a list of words that it does not spell check.
Words in the list are shared with all open documents in Studio.
In effect, the Ignore all list acts like a dictionary. However, unlike a dictionary, the ignore all list is cleared when Studio starts up.