To affect inbound coattailing, delay the VTAM® WRITE operation. This is effective because VTAM normally reads data after transferring data to the SNA controller or to another VTAM. By delaying VTAM longer before it performs a WRITE operation, more data can potentially accumulate in the SNA controller or other VTAM host, which can be read in the same I/O operation as the WRITE channel program. You can control the time interval during which VTAM buffers low priority data before transferring it over the channel to another VTAM, NCP, or SNA cluster controller by coding the DELAY operand on the appropriate VTAM definition statement.