BSP how to pass a parameter using URL

What is URL?
Lame man term
-the place on the address bar where we type the internet address.
Real meaning
Abbreviation: Uniform (or universal) resource locator, the address of a World Wide Web page

For BSP

If you use "Page with Flow logic", you can check field "Auto" in the "Page Attributes" tab.
Example:
Page attributes
http://myserver.com/schedule_maintain.htm?reload=X

 

Source