At 4:06 into the 'Executing Binaries' video of the Powershell series, Don manipulates the autocomplete function to scroll through commands beginning with 'IE'. How did he do that?
By repeatedly pressing the Tab key. In Powershell, press Tab to complete the command or filename with one possibility; if it isn't the right one, press Tab again to try a different one. If you press Tab too many times and pass the one you are looking for, press Shift-Tab to go backwards.
This is a bit different from other shells like Linux bash and Cisco IOS, where Tab will only complete a command when you've typed enough characters to identify a unique one. There is usually a way to get a list of commands or files starting with the characters you've typed. in bash, press Tab a second time. In Cisco IOS, press '?'.