2 throw in some line continuations for readability; reorder --dest so that whimsical dbus-send(1) actually accepts the command line
source | link

Session:

dbus-send --session           \
  --dest=org.freedesktop.DBus \
  --type=method_call          \
  --print-reply --dest=org.freedesktop.DBus              \
  /org/freedesktop/DBus       \
  org.freedesktop.DBus.ListNames

System:

dbus-send --system            \
  --dest=org.freedesktop.DBus \
  --type=method_call          \
  --print-reply --dest=org.freedesktop.DBus              \
  /org/freedesktop/DBus       \
  org.freedesktop.DBus.ListNames

You can also use DFeet if you prefer a GUI tool.

Session:

dbus-send --session --type=method_call --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ListNames

System:

dbus-send --system --type=method_call --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ListNames

You can also use DFeet if you prefer a GUI tool.

Session:

dbus-send --session           \
  --dest=org.freedesktop.DBus \
  --type=method_call          \
  --print-reply               \
  /org/freedesktop/DBus       \
  org.freedesktop.DBus.ListNames

System:

dbus-send --system            \
  --dest=org.freedesktop.DBus \
  --type=method_call          \
  --print-reply               \
  /org/freedesktop/DBus       \
  org.freedesktop.DBus.ListNames

You can also use DFeet if you prefer a GUI tool.

1
source | link

Session:

dbus-send --session --type=method_call --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ListNames

System:

dbus-send --system --type=method_call --print-reply --dest=org.freedesktop.DBus /org/freedesktop/DBus org.freedesktop.DBus.ListNames

You can also use DFeet if you prefer a GUI tool.