In this case the question is why would anyone (read PC user) To do this (maybe not needed and is committed to a clean look), But how to do so. Well, all in registry find solution, They are mains de tweakuri (Many still undiscovered by us).
So if you want to Disable System Tray in Windows 7 (Applies to users Vista), Open registry Editor without fear and attack. :) Type regedit.exe in Searchacquis in Start Menu and follow the path HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionPoliciesExplorer. In the right pane create entry DWORD (32-bit) NoTrayItemsDisplay and give them value 1 (1 = enable; 0 = disable).
Then give Logoff / Logon for the change to take effect.
If you do then pity time left alone and left corner of the monitor and change your mind about the system tray, then you just need to follow the same steps to NoTrayItemsDisplay and delete the entry or ii modify the value in 0. The clock will please: P.
Please note: even if you post System Tray walking, running applications usually it will be on and off, but hidden. To disable it, uncheck it from Startup (run-> msconfig-> startup).