INT 2F - SoftCom programs - API
        AH = DDh
        AL = FEh get info
            Return: ES:BX -> TSR info list (see below)
        AL = program identifier
            BH = function
                FDh get version
                    Return: BX = version
                FFh installation check
                    Return: AL = FFh if installed
                                BX = version
                                ES = segment of resident code
                others vary by program
Return: AL = status
            bit 7 set on error
            AL = 81h unknown function

Format of TSR info list:
Offset  Size    Description
 00h  9 BYTEs   blank-padded ASCIZ program name
 09h    BYTE    program ID
 0Ah    WORD    program's PSP segment
 0Ch    WORD    program version (major in high byte)
 0Eh    DWORD   pointer to next item in info list or 0000h:0000h
 12h    BYTE    number of interrupts hooked
 13h  5 BYTEs   interrupt numbers hooked by program
 18h  8 BYTEs   reserved