There are a few special character sequences, which all begin with the '~' character. All other characters pass through unchanged. The special control sequences in data lines are:
replaced by a single '~' character
replaced with a newline character
replaced by the user's callsign
replaced by the Error variable
replaced with a bell character
replaced by the name of the host computer
replaced by the current date
replaced by the current time
un-terminate the current line; remove ending newline character
replaced by the elapsed time of this script, in seconds
replaced with the file position of the current data file
replaced by variable string 0 .. 9
replaced by value of index 0 .. 9