Voice of my experience

Using Screen command you can create multiple pseudo-terminals. It becomes very convenient when you are working on a remote server and need to do different thing simultaneously. I always keep forgetting the keys to operate the screen , so I am posting a reference to recall.

C-a ' C-a "	(select) Prompt for a window identifier and switch.
C-a 0...9	(select 0...select 9) Switch to window number 0...9.
C-a C-a	(other) Toggle to the window displayed previously.
C-a a	(meta) Send the command character (C-a) to window.
C-a A	(title) Allow the user to enter a title for the current window.
C-a b itemx C-a C-b	(break) Send a break to the tty.
C-a B	(pow_break) Close and reopen the tty-line.
C-a c C-a C-c	(screen) Create a new window with a shell and switch to that window.
C-a C	(clear) Clear the screen.
C-a d C-a C-d	(detach) Detach screen from this terminal.
C-a D D	(pow_detach) Detach and logout.
C-a f C-a C-f	(flow) Cycle flow among `on', `off' or `auto'.
C-a C-g	(vbell) Toggle visual bell mode.
C-a h	(hardcopy) Write a hardcopy of the current window to the file "hardcopy.n".
C-a H	(log) Toggle logging of the current window to the file "screenlog.n".
C-a i C-a C-i	(info) Show info about the current window.
C-a k C-a C-k	(kill) Destroy the current window.
C-a l C-a C-l	(redisplay) Fully refresh the current window.
C-a L	(login) Toggle the current window's login state.
C-a m C-a C-m	(lastmsg) Repeat the last message displayed in the message line.
C-a M	(monitor) Toggle monitoring of the current window.
C-a SPC C-a n C-a C-n	(next) Switch to the next window.
C-a N	(number) Show the number (and title) of the current window.
C-a p C-a C-p C-a C-h C-a BackSpace	(prev) Switch to the previous window (opposite of C-a n).
C-a q C-a C-q	(xon) Send a ^Q (ASCII XON) to the current window.
C-a r C-a C-r	(wrap) Toggle the current window's line-wrap setting (turn the current window's automatic margins on or off).
C-a s C-a C-s	(xoff) Send a ^S (ASCII XOFF) to the current window.
C-a t C-a C-t	(time) Show the load average and xref.
C-a v	(version) Display the version and compilation date.
C-a C-v	(digraph) Enter digraph.
C-a w C-a C-w	(windows) Show a list of active windows.
C-a W	(width) Toggle between 80 and 132 columns.
C-a x C-a C-x	(lockscreen) Lock your terminal.
C-a z C-a C-z	(suspend) Suspend screen.
C-a Z	(reset) Reset the virtual terminal to its "power-on" values.
C-a .	(dumptermcap) Write out a `.termcap' file.
C-a ?	(help) Show key bindings.
C-a C-\	(quit) Kill all windows and terminate screen.
C-a :	(colon) Enter a command line.
C-a [ C-a C-[ C-a ESC	(copy) Enter copy/scrollback mode.
C-a ] C-a C-]	(paste .) Write the contents of the paste buffer to the stdin queue of the current window.
C-a {	(history) Copy and paste a previous (command) line.
C-a >	(writebuf) Write the paste buffer out to the screen-exchange file.
C-a <	(readbuf) Read the screen-exchange file into the paste buffer.
C-a =	(removebuf) Delete the screen-exchange file.
C-a _	(silence) Start/stop monitoring the current window for inactivity.
C-a ,	(license) Show the copyright page.