When your TSO/E profile allows prompting, most TSO/E commands prompt you for missing operands. For example, the TRANSMIT command prompts you for a node and user ID when you do not include the destination with the command.

An exec can put responses to command prompts on the data stack. Because of the information search order, the data stack supplies the necessary information instead of a user at the terminal.

For example, the following exec puts the TRANSMIT command and its operands on the data stack. When the exec completes, the TSO/E data stack service continues to get input from the data stack. Thus the TRANSMIT command is issued after the exec ends.