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+{{page>en:templates:dosint}}
+====== Int 21H, AH=52H ======
+===== Version =====
+and higher
+===== Brief =====
+"SYSVARS" - GET LIST OF LISTS
+===== Family API =====
+===== Input =====
+	AH = 52h
+===== Return =====
+   ES:BX -> DOS list of lists (see #01627)
+===== Notes =====
+	partially supported by OS/2 v1.1 compatibility box (however, most
+	  pointers are FFFFh:FFFFh, LASTDRIVE is FFh, and the NUL header "next"
+	  pointer is FFFFh:FFFFh).
+	partially supported by the Windows NT DOS box; contains only a
+	  rudimentary Current Directory Structure (see #01645)
+	on return, ES points at the DOS data segment (see also INT 2F/AX=1203h)
+	Quarterdeck's suggested check for the use of its DOSDATA.SYS or
+	  DOS-UP.SYS is to test whether the list-of-lists segment is greater
+	  than the segment of the first memory block; a better check for
+	  DOS-UP.SYS is INT 21/AX=2B01h/CX=444Dh
+	because not all DOS workalikes support all fields in the List of Lists,
+	  applications should ensure that pointers are neither 0000h:0000h
+	  nor FFFFh:FFFFh before using them
+	Windows for Workgroups 3.11 network and Windows95 set the path to
+	  the local drive and directory even for network drives; in that
+	  case the UNC form \\SERVER\SHARE can be obtained with
+	  INT 21/AX=5F02h or INT 21/AX=5F46h. LapLink RemoteAccess does the
+	  same even for INT 21/AX=5F02h
+	Windows95 GUI no longer returns the true path for a SUBSTed drive,
+	  but MS-DOS 7.00 does; use INT 21/AH=60h to obtain the true name
+===== See also =====
+ INT 2F/AX=1203h
+===== Note =====
+Text based on [[http://www.cs.cmu.edu/~ralf/files.html|Ralf Brown Interrupt List Release 61]]
+{{page>en:templates:int}}
+{{page>en:templates:fapi}}