When you send data to an application program, you often must end the data with the newline escape sequence, "\r" or "\r\n" for most remote applications, and "\n" for local applications.  This sequence simulates the Return/Enter key on the keyboard.  Most applications do not recognize input until they receive the newline character.  For example, the statement:

send "Start\n" to Database

sends the word, "Start", terminated by a newline character, to the application program named Database.