Windows 7 allows users to quickly launch a program from taskbar by using Pin this program to taskbar feature. For example if you use Microsoft Word 2010 frequently then you can pin this program to Windows 7 taskbar. This can be done by the following steps
Open Microsoft Word 2010 in your Windows 7 PC.
Right click on the Word 2010 icon in the taskbar. This would display the following list of options
Select Pin this program to taskbar from the list of available options.
This would now display Word 2010 icon as part of the available programs that can be launched from Windows 7 Taskbar