How to define a single hotkey in a dialog box

[win]

I don't quite understand why these two variables are the same

Macro Macro1

Code:

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int- t_mainDlg
int w=win("Dialog" "#32770")
;just outputting 2 variables for testing they are both dialog window handle and should be the same
out w
out t_mainDlg
;either of the above two vars should work as they are the same

I did not find t_mainDlg in the QM help. In addition, I found that many times you will need the prefix (t_) variable. Where are these variables found?

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In a few days, I will try again after upgrading the operating system to windows 10. Thank you very much for your help.