struc ExecState
 esReserved     dw ?            ; Reserved
 esFlags        dw ?            ; Type flags
 esProgName     dd ?            ; Points to ASCIIZ string of program name
 esPSP          dw ?            ; PSP segment of the new program
 esStartAddr    dd ?            ; Starting CS:IP of the new program
 esProgSize     dd ?            ; Byte size of program, including PSP
ends                            ; = 18d bytes

        ; esFlags (ORable)
        ES_COM     = 0000h
        ES_EXE     = 0001h
        ES_OVERLAY = 0002h