..create a Pop up button that appears after a specified time while viewing a screen?

First question, I am programming a delayed recall task where the subjects have to recall several brand names. They can type in their responses after seeing a cue. Once they start typing the [I]"Continue" [/I]button becomes active. However, if they do not type anything, I wanted a prompt to appear after 12 seconds that says [I]"Try to remember the brand name, if you can't, please press the _________ key"[/I]
Of course the (___________) key would enable the subject to proceed to the next part of the recall task. Second question, could this be the "Escape" key?
Thanks.

Here are a couple links that might help. They offer samples that produce pop-up windows during a MediaLab session. The first provides a manual link for the popup and the second offers hints that pop up automatically at timed intervals.

[URL]http://www.empirisoft.com/support/showthread.php?t=526[/URL]
[URL]http://www.empirisoft.com/support/showthread.php?p=1748[/URL]