The time at which response window begins.
<block> <defaults> <expt> <likert> <openended> <response> <slidertrial> <trial>
The following displays the value of windowonset in a text stimulus:
<text sometext>
/ items= ("windowonset = <% response.foo.windowonset %>")
</text>
The following displays the value of windowonset in an instruction page:
<page somepage>
windowonset = <% response.bar.windowonset %>
</page>