The macrosubstittution could be the best solution in this case.

TEXT To lcSQL NOSHOW TEXTMERGE PRETEXT 15
SELECT T.Cnomteleph , T.iid FROM
Employee AS 'E' INNER JOIN TELEPH AS 'T' ON E.iTelephoneid = T.iid
    INNER JOIN Horaire AS 'H' ON E.iid = H.iEmployeeId
    WHERE H.ddate BETW  THISFORM.ddebut AND THISFORM.dfin
    GROUP BY 1 , 2 INTO ARRAY taSelectedList
ENDTEXT

&lcSQL

>I did not know that one could put a parameter!
>
>