There are some things that I really hate when developing with Navision
and this is one of this... 
Navision debugger is not one of the best and friendly debugger that you can
see (if you are like me and you work a lot with VS.NET debugger,
you'll find this terrible! 
) and sometimes to check problems on my
applications I love placing message box to evaluate variables and trace
execution (often I do the same with Visual Studio).
With Visual Studio .NET you've no problem by doing this... if you place a
message box on a loop (maybe with lots of iterations) and you want to stop the
execution, you can do it easily. And with Navision?
With Navision, you don't have the possibility to stop execution!! If you
place a debug message box on a loop and you want to stop the execution, you're
forced to kill the environment. 
Bleah!
Usually I try to avoid these situations, but sometimes they can occour...
here's my last pain:
I was debugging an application that retrieves data from a DB, works on it and
print a report. On the data retrieval loop I've placed a debug message box:
Unfortunately the loop was too long and I want to stop the execution. How can
you do it? CTRL+ALT+CANC, Task Manager, select your Navision process and kill
it.
I think that a feature to stop the execution is a necessity for the future...
but someone of the core staff will never bring these inputs?