tcd_msg_enabled
tcdp->tcd_msg_enabled = 0;
tcdp->tcd_msg_enabled = ntype;
if (tcdp->tcd_msg_enabled) {
while ((ntype = tcdp->tcd_msg_enabled) == 0)
tcdp->tcd_msg_enabled = 0;
tcdp->tcd_msg_enabled = 0;