+ *
+ * dynamic window manager is designed like any other X client as well. It is
+ * driven through handling X events. In contrast to other X clients, a window
+ * manager like dwm selects for SubstructureRedirectMask on the root window, to
+ * receive events about child window appearance and disappearance. Only one X
+ * connection at a time is allowed to select for this event mask.
+ *
+ * Calls to fetch an X event from the event queue of the X connection are
+ * blocking. Due the fact, that dwm reads status text from standard input, a
+ * select-driven main loop has been implemented which selects for reads on the
+ * X connection and STDIN_FILENO to handle all data smoothly and without
+ * busy-loop quirks. The event handlers of dwm are organized in an array which
+ * is accessed whenever a new event has been fetched. This allows event
+ * dispatching in O(1) time.
+ *
+ * Each child window of the root window is called a client in window manager
+ * terminology, except windows which have set the override_redirect flag.
+ * Clients are organized in a global doubly-linked client list, the focus
+ * history is remembered through a global stack list. Each client contains an
+ * array of Bools of the same size as the global tags array to indicate the
+ * tags of a client. There are no other data structures to organize the clients
+ * in tag lists. All clients which have at least one tag enabled of the current
+ * tags viewed, will be visible on the screen, all other clients are banned to
+ * the x-location x + 2 * screen width. This avoids having additional layers
+ * of workspace handling.
+ *
+ * For each client dwm creates a small title window which is resized whenever
+ * the WM_NAME or _NET_WM_NAME properties are updated or the client is resized.
+ * Keys and tagging rules are organized as arrays and defined in the config.h
+ * file. These arrays are kept static in event.o and tag.o respectively,
+ * because no other part of dwm needs access to them. The current mode is
+ * represented by the arrange function pointer which wether points to dofloat
+ * or dotile.
+ *
+ * To understand everything else, start with reading main.c:main().