Certain strings are treated as filenames in tf (%{TFHELP}; %{TFLIBDIR}; %{TFLIBRARY}; arguments to /load, fwrite(); etc.). Those strings undergo filename expansion as described below.
If file begins with '~', all characters after the '~' up to the first '/' or end of string are treated as a user name, and the '~' and user name are replaced with the name of the home directory of that user. If the user name is empty, %{HOME} is substituted.
For example, if bob's home directory is /users/bob, then the command
"/load ~bob/macros.tf"
will attempt to load the file /usrs/bob/macros.tf.
"~user" expansion is not supported on systems that do not have the getpwnam() function.