The send commands option is used to send one command to multiple lines. When you select the "Send Commands" option a command window will pop up. Any command you enter here will be sent to all lines that have a check mark. This can be useful if you have multiple devices of the same type and you want to send "no shut" to an interface. Another example is if you have multiple switches and you want to set an ip address on interface Vlan1 and then want to do a copy an IOS from tftp.