Are there any examples of worksheets / workbooks that have a file open / save dialogue box?

I'm playing around trying to save data from a worksheet, and would like to have a dialogue box where the user can pick a directory and a name for storing the data.

Are there any established (or not established but cool) methods to exchange data between different worksheets or workbooks?

Actually there are 2 questions.

1. If I have 2 different worksheets or workbooks open in Maple, and want to exchange data between them.
2. One workbook, but different worksheets in the same workbook.

Apparently the return value of a GetProperty check is not a boolean variable, but something else.

Why?

boolean.mw

The Maple Units implementation is really causing a lot of trouble.

Right now I'm getting results in Joule, but I want to convert to kN*m.

Can someone explain to me this?

Without loading Units, conversion works.

When loading Units, regardless of simple or standard, it doesn't work anymore.

Any idea what this could mean?

I'm comparing 2 matrices where one of them is empty, and the other one is unitfree.