IE Toolbar?

This is called Windows Shell programming. And its no way related to Unix shell programming.

Basically in windows, the Windows Explorer is called as Windows Shell.

This explorer Bar is common for Windows Explorer and also Internet explorer. But u can differentiate them.

For more info
Check this

Here u can find some sample code.

http://www.dev-archive.com/Cpp/COM-Tech/shell/

http://codeproject.com/shell/