Xlsclients is a utility for listing information about the client
applications running on a display. It may be used to generate scripts
representing a snapshot of the user's current session.
This option indicates that
clients on all screens should be listed. By default, only those clients
on the default screen are listed.
-l
List in long format, giving the window
name, icon name, and class hints in addition to the machine name and command
string shown in the default format.
-m maxcmdlen
This option specifies the
maximum number of characters in a command to print out. The default is
10000.