The nextkey attribute specifies which response advances to the next instruction page.
<instruct>
or
/ nextkey = (scancode)or
/ nextkey = (signal)| character | A character indicating a correct keyboard response. | 
| scancode | An integer specifying the scancode of a correct keyboard response. See the scancodes table for corresponding key value assignments. | 
| signal | An integer representing the response code of a serial or parallel port device such as a response box. | 
The default value is the space bar, " ".
The following sets the previous key to the "m" key:
<instruct>
/ nextkey = ("m")
</instruct>