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struc LoadExec
 leEnvironment  dw ?    ; Environment-block segment
 leCommandTail  dd ?    ; Address of command tail
 leFCB_1        dd ?    ; Address of default FCB #1
 leFCB_2        dd ?    ; Address of default FCB #2
ends                    ; = 14d bytes

;       ; leEnvironment
;       if 0000h, parent's environment block is duplicated to child,
;       else segment of memory block containing child's environment.
;
;       ; leCommandTail
;       Pointer to the command tail that DOS copies to the child
;       program's PSP, offset 0080h.
;       Any redirection of standard files must be accomplished by the
;       parent program. Including redirection characters (< > |) does
;       not redirect files.
;       Refer to PSP for format requirements.
;
;       ; leFCB_1, leFCB_2
;       Pointer to the 2 default FCBs that DOS copies to the child
;       program's PSP, offset 5Ch and 6Ch, respectively.