xlsclients - list client applications running on a display
xlsclients [-display displayname] [-a] [-l] [-m maxcmdlen]
This option specifies the X server to contact.
This option indicates that clients on all screens should be
listed. By default, only those clients on the default screen are listed.
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
This option specifies the maximum number of characters in
a command to print out. The default is 10000.
command 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
To get the default host, display number, and screen.
Jim Fulton, MIT X Consortium