// start a process using default locale
	`Execute(.process.start_shell, "/bin/date")
	(14896)
	`Read(.process.read, 14896)
	("PĂĄ Ăşno 15 07:15:24 CET 2008\n")
	`Read(.process.running, 14896)
	(false)
	`Read(.process.status, 14896)
	(0)
	// start a process in C locale, in a terminal, set the environment
	`Execute(.process.start_shell, "/bin/date", $["C_locale":true, "tty":true, "env":$["FOOVAR":"FOO"]])
	(14899)
	`Read(.process.read, 14899)
	("Fri Feb 15 07:18:02 CET 2008\r\n")
	// list processes
	`Dir(.process)
	([14896, 14899])
	// release process (free allocated buffers...)
	`Execute(.process.release, 14896)
	(true)
	`Dir(.process)
	([14858, 14899])
	// read/write lines example
	`Execute(.process.start_shell, "cat")
	(14900)
	`Write(.process, 14900,"the first line\nthe second line\n")
	(true)
	`Read(.process.read_line, 14900)
	("the first line")
	`Read(.process.read_line, 14900)
	("the second line")
	`Read(.process.read_line, 14900)
	(nil)
	// read complete output
	// check whether the buffer (output) is empty
	// (even if process is dead, buffer might contain something)
	`Write(.process, 14900,"the first line\nthe second line\n")
	(true)
	// buffer is not empty
	`Read (.process.buffer_empty, 14900)
	(false)
	`Read(.process.read, 14900)
	("the first line\nthe second line\n")
	// buffer is empty after .read
	`Read (.process.buffer_empty, 14900)
	(true)
	// close input/output
	`Read(.process.running, 14900)
	(true)
	`Execute(.process.close, 14900)
	(0)
	`Read(.process.running, 14900)
	(false)
 The process agent can run multiple subprocesses in backgroung with full interaction
 (reading stdout/stderr, writing to stdin).
 It is possible to run a subprocess in terminal (instead of piped output/input).
 This agent obsoletes the background agent (ag_background).