storage identifier:

A randomly-looking identifier string starting with 'pbox-' that identifies the session in the repository it comes from. The repository is typically typically specific to the user's home directory: $XDG_CACHE_HOME/plainbox/sessions.

app:

The name of the application that created the session. Typically plainbox or checkbox. Plainbox only resumes sessions it has itself created.

flags:

A list of flags. Existing flags are:

Note that other flags are possible and they are perfectly fine. Applications can define their own flags that are not documented here or even understood by the core.

title:

An arbitrary "title" of the session. Plainbox typically uses the command line that was used to launch the session but other applications may come up with more interesting titles. Plainbox also uses the title to match find a possible resume candidate.

--only-ids=False

print one id per line only