All keywords known for M-. are recognized by the , command when scanning for strings, and strings already marked by any of those known keywords are automatically skipped. If many PO files are opened simultaneously, each one has its own independent set of known keywords. Also, if you have problems with the image size on your website, you can always use Facebook PSD mockup. Migrate your blog → Get up and running in seconds. This is easy to do. In any shell window, change the directory to the root of your project, then execute a command resembling: etags src/*.[hc] lib/*.[hc] presuming here you want to process all .h and .c files from the src/ and lib/ directories.