Here is an interesting light weight software(86.6kb) from volumedigger named My Quotes. This light weight software utility could be used to update your amibroker software in realtime tick data from Yahoo Finance at free of cost. Now thats sounds totally amazing!
How you could make it?
1) Download Myquotes
2) Extract the files to your amibroker path(By default C:\>Program Files\Amibroker )
3)Open Amibroker
3) Create a new Amibroker database named YahooIntraday set the Base time interval to Tick Data
4)Open Myquotes.exe from the amibroker folder
5)Give your yahoo username and password
6)Once you logged in Now goto File from the menu bar and select Select Amibroker path
7)And choose your path to New Amibroker Database i.e C:\>Program Files\Amibroker\YahooIntradau
8)Now from the menu bar select Download->Start Yahoo RT Data
9)Also you can adjust the time corrective settins from the options coloumn from the settings
10)You are done now watch your real time charting updating
Notes and caution
1)Backfill is not possible
2)If power or your internet goes down then you cant get the missed Intraday data
2)If you want to change the symbols edit symbollist.txt file in amibroker folder and use only Y! Finance symbols
3)Use lookup to get Y! Finance Symbols for any sort of script
Local download: 
Zmarketcalls 