How can i clear the screen in QNX4?

Is there a system call or command to clear the console in Qnx4.I just want to display my messages in a clean screen.
I know that it can be done by a simple command in Linux.
But how can do it in Qnx4?
Thanks in advance.

type a CTRL-L (form feed)

Yes!CTRL-L is right!
But what should i do in my program code?Is there any system functions?
I tried fflush( stdout ), but it just flushs the buffer.

a quick search of “clear screen” here shows those:

Use: echo “\14”

Good luck!