AH = 13h
Return: BX:AX -> task control block (see below)

Format of MultiDOS Plus v4.0 task control block:
Offset  Size    Description
00h    DWORD   pointer to next TCB
04h  8 BYTEs   ASCIZ task name
0Ch  2 BYTEs   ???
0Eh    WORD    task PSP segment
10h    WORD    abort/suspend flags
12h    WORD    current screen segment (see AH=0Bh,AH=0Ch)
14h    WORD    priority level (0000h-FFFEh)
16h    WORD    time slice counter
18h  2 BYTEs   ???
1Ah    WORD    suspend timer value
1Ch    WORD    stack segment
1Eh    WORD    stack pointer
20h    WORD    display type
22h    WORD    display memory
24h  2 BYTEs   ???
26h    WORD    termination count
28h    WORD    equipment flag for BIO10 driver
2Ah    BYTE    background CRT mode
2Bh    WORD    screen width in columns
2Dh    WORD    screen size in bytes
2Fh    WORD    segment of physical screen memory
31h 16 BYTEs   eight cursor positions
41h    WORD    current cursor shape
43h    BYTE    active display page
44h    WORD    CRT controller I/O port base
46h  2 BYTEs   ???
48h    WORD    foreground task flag
4Ah  6 BYTEs   ???
50h    WORD    saved video segment (see AH=0Bh,AH=0Ch)
52h    DWORD   old INT 22
56h    DWORD   old INT 23
5Ah    DWORD   old INT 24
5Eh    WORD    top of memory for task
60h  4 BYTEs   ???
64h    WORD    DTA segment (see INT 21/AH=1Ah)
66h    WORD    DTA offset
68h  4 BYTEs   ???
6Ch    BYTE    current ANSI.SYS attribute
6Dh    BYTE    current ANSI.SYS column
6Eh    BYTE    current ANSI.SYS row
6Fh    BYTE    current ANSI.SYS display state
70h    BYTE    maximum ANSI.SYS columns
71h    BYTE    current ANSI.SYS page
72h    WORD    saved ANSI.SYS cursor position
74h    BYTE    ANSI.SYS parameter buffer index
75h    BYTE    current ANSI.SYS screen mode
76h    BYTE    ANSI.SYS wrap flag
77h  6 BYTEs   ANSI.SYS parameter buffer
7Dh    BYTE    ANSI.SYS keyboard DSR state
7Eh  7 BYTEs   ANSI.SYS keyboard DSR buffer
85h  3 BYTEs   ???
88h 16 BYTEs   request header for DOS driver calls
98h 14 BYTEs   ???
A6h    WORD    segment of EMS map if EMS task
A8h    WORD    flag: task makes EMS calls
AAh    WORD    EMS handle for task
ACh    WORD    keyboard shift state
AEh 12 BYTEs   ???
BAh    WORD    TCB of parent if child task
BCh    WORD    termination code
BEh    WORD    COM port number
C0h  4 BYTEs   ???
C4h    WORD    current IRQ number
C6h  2 BYTEs   ???
C8h    WORD    miscellaneous flag word
CAh  2 BYTEs   ???
CCh    DWORD   old INT 10
D0h    WORD    EMS alternate map set number
D2h 414 BYTEs  DOS current disk and directory context (optional)

See also: 1515