You can type in a new name in the document name text field above the
drawing area. When you enter <Return>, the document name is changed.
TCM checks whether the name has a valid suffix
for the current type of document. See figure 2.3
for the required suffixes. Furthermore, the document name should contain
only non-white space printable characters and it should not contain
the characters {, } or /.
When a document is loaded, the document name field is set to the name of that document. If a new document is created, either by starting the editor without a file name or by issuing the New command, the newly created document will receive the default name untitled.