I wonder how i can call the following link using include( "); . I tried the following and it gives me error :

include("who.php?action=who");

Error :

Code:
Warning: main(./who.php?action=who) [function.main]: failed to open stream: Invalid argument in c:\myserver\www\whoisonline2\welcome.php on line 2

Warning: main() [function.include]: Failed opening './who.php?action=who' for inclusion (include_path='.;C:\php5\pear') in c:\myserver\www\whoisonline2\welcome.php on line 2

Fatal error: Call to undefined function track() in c:\myserver\www\whoisonline2\welcome.php on line 4
but when i type who.php?action=who in browser it works well and it executes the who.php for me but it does not work when i use it in include. I be happy if some one tell me how to fix this problem.Thanks