INT 2F U - DOS 4.x only SHELLB.COM - SHELLB transient to TSR intrface
AX = 1904h
Return: ES:DI -> name of current shell batch file:
WORD    number of bytes of name following
BYTEs   (8 max) uppercase name of shell batch file


2F1904 - DOS 4.x only SHELLB.COM - SHELLB transient to TSR intrface