Use channel “chnl” to create and open file “file” in access mode “access” and share mode “shrmod”
valid channels: 0 - 7 [0 is used for script questionnaires]
valid access modes: O_RD, O_WR, O_RW [should use O_WR]
valid share modes: S_DN, S_DR, S_DW, S_DB
See also: FOpen, FClose, FAppend