Keys

Question

Hi I seem to be running into a bit of trouble. I found found the function Sendkeys to beable to send a key and also repeatedly send a key to the computer. But I am looking for a function that will tell the computer a key is being pressed down, then i guess sleep for 3 seconds, and then released after. Is this possible? I have look through a lot of stuff on google but have found nothing.  So if anyone of you can help that would be awesome!