Zettel identifier are typically created by examine the current date and time. By renaming the name of the underlying zettel file, you are able to provide any sequence of 14 digits. To make things easier, you must not use zettel identifier that begin with four zeroes (0000). All zettel provided by an empty zettelstore begin with six zeroes Exception: the predefined home zettel 00010000000000. But you can configure another zettel with another identifier as the new home zettel.. Zettel identifier of this manual have be chosen to begin with 000010. However, some external applications may need at least one defined zettel identifier to work properly. Zettel Zettelstore Application Directory (00000999999999) can be used to associate a name to a zettel identifier. For example, if your application is named app, you create a metadata key app-zid. Its value is the zettel identifier of the zettel that configures your application. Reserved Zettel Identifier From To Description 00000000000000 00000000000000 This is an invalid zettel identifier 00000000000001 00000999999999 Predefined zettel 00001000000000 00001099999999 This Zettelstore manual 00001100000000 00008999999999 Reserved, do not use 00009000000000 00009999999999 Reserved for applications External Applications From To Description 00009000001000 00009000001999 Zettel Presenter, an application to display zettel as a HTML-based slideshow