-If the input line starts with '>>> ', this prefix and any trailing spaces
-(including line feed) are removed. The reminder is processed with Perl's string
-eval() function, effectivly evaluatiing escape sequences like '\x41', '\r', and
-such. If you need a line feed there, you need to encode it according to your
-needs.
+If the input line starts with ':<cmd>:', this prefix is removed and the
+line is processed by the runtest script before sending. The following
+commands are recognised:
+
+- "eval": process the reset of the line with Perl's string eval()
+ function. This can be used to send arbitrary data by encoding it as
+ escape sequences (e.g. "\x41\101"). If you need a line ending, you have
+ to append it accordingly (e.g. "\r\n").
+
+- "noeol": do not terminate the data sent to the application with an end
+ of line character.
+
+- "sleep": interpret the rest of the line as an integer and sleep for
+ that number of seconds before proceeding. No data will be output to
+ the application.