cscope

http://cscope.sourceforge.net/cscope_vim_tutorial.html

cscope vs ctag
http://stackoverflow.com/questions/934233/cscope-or-ctags-why-choose-one-over-the-other

hwo to search
http://vim.wikia.com/wiki/Cscope

shortcuts in VIM:

http://thripal.blogspot.com/2009/10/cscope-with-vim.html