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Its very valuable to know that you can have a window object and automatically be entering commands within the -t (target) context.
From tmux manual:
This section contains a list of the commands supported by tmux. Most
commands accept the optional -t argument with one of target-client,
target-session target-window, or target-pane. These specify the
client, session, window or pane which a command should affect.
target-client is the name of the pty(7) file to which the client is
connected, for example either of /dev/ttyp1 or ttyp1 for the client
attached to /dev/ttyp1. If no client is specified, the current client
is chosen, if possible, or an error is reported. Clients may be listed
with the list-clients command.
target-session is the session id prefixed with a $, the name of a ses‐
sion (as listed by the list-sessions command), or the name of a client
with the same syntax as target-client, in which case the session
attached to the client is used. When looking for the session name,
tmux initially searches for an exact match; if none is found, the ses‐
sion names are checked for any for which target-session is a prefix or
for which it matches as an fnmatch(3) pattern. If a single match is
found, it is used as the target session; multiple matches produce an
error. If a session is omitted, the current session is used if avail‐
able; if no current session is available, the most recently used is
chosen.
target-window specifies a window in the form session:window. session
follows the same rules as for target-session, and window is looked for
in order: as a window index, for example mysession:1; as a window ID,
such as @1; as an exact window name, such as mysession:mywindow; then
as an fnmatch(3) pattern or the start of a window name, such as myses‐
sion:mywin* or mysession:mywin. An empty window name specifies the
next unused index if appropriate (for example the new-window and
link-window commands) otherwise the current window in session is cho‐
sen. The special character ‘!’ uses the last (previously current) win‐
dow, ‘^’ selects the highest numbered window, ‘$’ selects the lowest
numbered window, and ‘+’ and ‘-’ select the next window or the previous
window by number. When the argument does not contain a colon, tmux
first attempts to parse it as window; if that fails, an attempt is made
to match a session.
target-pane takes a similar form to target-window but with the optional
addition of a period followed by a pane index, for example: myses‐
sion:mywindow.1. If the pane index is omitted, the currently active
pane in the specified window is used. If neither a colon nor period
appears, tmux first attempts to use the argument as a pane index; if
that fails, it is looked up as for target-window. A ‘+’, ‘-’ or ‘!’
indicate the next, previous or last pane. One of the strings top,
bottom, left, right, top-left, top-right, bottom-left or bottom-right
may be used instead of a pane index.
The special characters ‘+’ and ‘-’ may be followed by an offset, for
example:
select-window -t:+2
When dealing with a session that doesn't contain sequential window
indexes, they will be correctly skipped.