Function  12h   Search For Next Entry Using FCB                          (FCB) 
      Search for next matching filename 
entry   AH      12h  
	DS:DX   pointer to the unopened FCB specified from the previous Search 
		First (11h) or Search Next (12h) 
return  AL      00h     if matching filename found 
		0FFh    if matching filename was not found 
note 1) After a matching filename has been found using function call 11h,  
	function 12h may be called to find the next match to an ambiguous  
	request. For DOS 2.x, ?'s are allowed in the filename. For DOS 3.x  
	and 4.x, global (*) filename characters are allowed. 
     2) The DTA contains info from the previous Search First or Search Next.  
     3) All of the FCB except for the name/extension field is used to keep  
	information nescessary for continuing the search, so no disk operations  
	may be performed with this FCB between a previous function 11h or 12h  
	call and this one. 
     4) If the file is found, an FCB is created at the DTA address and set up to 
	open or delete it.