INT 2F CU - NETWORK REDIRECTOR - CHDIR                                          
	AX = 1105h
	SS = DOS DS
	SDAsee Swappable Data Area first filename pointer -> fully-qualified directory name
	SDAsee Swappable Data Area CDSsee Current Directory Structure pointer -> current directory structure for drive with dir
Return: CF set on error
	    AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
	CF clear if successful
	    CDSsee Current Directory Structure updated with new path
Notes:	this function is called by the DOS 3.1+ kernel
	directory string in CDSsee Current Directory Structure should not have a terminating backslash unless
	  the current directory is the root
SeeAlso: AX=1101h,AX=1103h,INT 21/AH=3Bh,INT 21/AH=60h