Emacs shortcuts to remember

C-h C-h  : help
C - c C-j : add item in Auc Tex
Esc - x : command line  ( this is mine)
C - x C - l : lowercase region
C - x C -u : upcase region
C - x r w a : save in registry a the window configuration
C - x r j a : retrieve cofiguration a
C - x r t : prefix all the sketched lines
C- x v v : commit