>>>How do you detect if a memory variable exists without causing a program to stop?
>>
>>Use vartype(myVar)<>'U'
>>
>>Or use type('MyVar') <> 'U' for more complex cases.
>
>type('MyVar') <> 'U' wouldn't work if you have a field with the same name :-)

Good point, though I updated my reply a bit while you were replying. But you didn't give me time to correct a typo in the word existence :)

Anyway, the best way to check would be

type('m.MyVar') <> 'U'

or vartype(m.MyVar) <> 'U'

to make sure we're talking about variables and not field names.