Debug Tool Bar

In the Debugging window, the tool bar provides quick access to the most common debugging operations, including:
Run the program from the beginning (Start)
Move up the call stack one function
Move down the call stack one function
Run the program from the current location (Continue)
Interrupt the program
Step one line (stepping into function calls)
Step one line (stepping over function calls)
Step past the end of the current function
Recompile all changed files and continue debugging (Fix and Continue)

The buttons are equal to the dbx commands:

run
up
down
cont
Ctrl+C
step
next
step up