To see the shell's filename completion in action simply start typing the first few letters of a command or filename, and hit the 'Tab' key (or 'Esc' key twice). The ability to report possible completions is possible by setting the "autolist" variable (by set autolist) - which can be added to the shells configuration file (~/.tcshrc).
tcsh reads several files upon startup. It always reads /etc/csh.cshrc and ~/.tcshrc. Login shells also read /etc/csh.login and ~/.login.
The place to put aliases and simple environment variable settings that you want every time you open a shell is in .tcshrc in your home directory. Example .tcshrc file:
setenv PAGER less alias md mkdir alias rd rmdir
Adding a directory to your PATH should not be done in your .tcshrc because it can get run multiple times. It should be in your .login file like this:
setenv PATH ~/bin:$PATH
Unlike bash, there is no need to call the .tcshrc file from the .login file, as tcsh reads the .tcshrc file even in login shells.
- tcsh wiki (www.tcsh.org)