Ordinarily, at startup TiddlyWiki displays the tiddlers specified as a filter in the tiddler $:/DefaultTiddlers.

Sometimes it's useful to re-open the same tiddlers that were open when the file was saved. To do so, set $:/DefaultTiddlers to this filter:

[list[$:/StoryList]]

This filter returns the tiddlers specified in the $:/StoryList tiddler, which is the system tiddler that TiddlyWiki uses to store the sequence of tiddlers in the current story.