INT 21 U - DOS 2+ internal - "SYSVARS" - GET LIST OF LISTS AH = 52h Return: ES:BX -> DOS list of lists Note: 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).