AT&T 6300 Programmer's Manual page 100

Disk File Handling
4-16
All characters that are valid for a filename are
also valid for a directory name.
Examples (supposing JOHN is the current
directory):
B:\SALES\MARV\REPORT
B: ..\MARV\REPORT
The GWBASIC command and some GWBASIC
commands allow you to specify a file by either a
"filename" or a "pathname" LOAD, MERGE,
NAME, OPEN, RUN and SAVE.
Some GWBASIC commands allow you to use
only the latter form of a "pathname." They are:
MKDIR, RMDIR, and CHDIR.
The FILES command allows you to use both
forms to display either all files residing on a
directory or a single file, or a group of files by
using wild cards
(*
and/or
?).