What you can do (and this applies to future coding too) is experiment it with it yourself. For example, if you're not sure when code exists a loop, write some dummy code at the beginning of the loop and step through it using F8. Another thing you could do is write something like:
Code:
do until a = b
if a = b
'do nothing
exit do
end if
'MORE CODE
loop
put a break point on:if your code breaks there, then you know that it is executing at least a part of the loop even when the condition is reached. strategies like this are good for learning how code works too.