INT 2F U - DOS 4.x only SHELLB.COM - SHELLB transient to TSR(Terminate and Stay Resident) A program which remains in memory after terminating in order to provide services to other programs or the user.  The name comes from the name of the DOS function call used to remain in memory after termination. interface
	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