Search Files -- in current folder only

[pshannon@iapetus.cv.nrao.edu (Paul Shannon)]

I'm not so familiar with pathnames and wildcards on the MacOS,
having been weaned on unix.  When I pop up the "Search Files"
dialog from the MCL Tools menu, the first dialog box looks like this:

  In Pathname    ccl:*;*.lisp

I've experimented, looked unsuccessfully at CLtL2, and not yet discovered
a brief way to set the pathname to "current folder" or "current folder
and below".  

What's the Search Files equivalent of the unix shell's "."?

 - Paul