Directory Aliases are a shorthand way of specifying pathnames. For example, if you define an alias:
alias pf:=c:\program files
You can then reference the files in c:\program files\jpsoft by entering pf:\jpsoft. Directory aliases work in places that accept filenames and directory names (internal command arguments or the first argument in a command line), including filename completion. You cannot use them in arguments to external applications, as TCC has no way of knowing what is a valid argument for external applications.
Directory alias names can be either two or more alphanumeric characters followed by a colon, or a single digit followed by a colon.
Directory aliases support environment variable expansion.