In the ITS system source directory SYSTEM; see the DISK module at
QSKONA+3:

	CAMN A,[SIXBIT /..NEW./]
         CAME B,[SIXBIT /(UDIR)/]
	  JRST [POP P,TT
		JRST QPNL20]
	BUG INFO,[DSK: DIR ],SIXBIT,C,[CREATED BY ],SIXBIT,UNAME(U),SIXBIT,JNAME(U)

To create a new directory, provide certain options to the open UUO
(ITS quivalent of system call; try the DOC UUO command.)  Since the
PRINT command calls the open UUO you can create a directory using
print:
 
	:print ..new. (udir) dirnam; 

Where dirnam; is the name of the directory to be created.  Directory
names are in sixbit (like everything else)

Top-level directory can be listed by reading file M.F.D. (FILE)