Single Step
Run the next line of code.
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This option allow you to run the program a single line at a time, whilst
remaining in and under full control of MrDebug. Each line of code is
executed, the window within the debugger are updated to reflect any changes
that have occurred and MrDebug waits for you to make the next move.

When single stepping a codeblock, a single step will occur for each
iteration of the codeblock - all variables will be accessible through the
variable's window.

The hot-key combination for this item is <F8>.