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how can I tell if more than one Thunderbird program is running on my computer

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a window popped up on my monitor that indicated I should determine if I had more than one Thunderbird program running on. Otherwise don't seem to be having a problem. In the past few months I had two active e-mail addresses and now only use one. The e-mail address I no longer use was a Reagan.com e-mail service

a window popped up on my monitor that indicated I should determine if I had more than one Thunderbird program running on. Otherwise don't seem to be having a problem. In the past few months I had two active e-mail addresses and now only use one. The e-mail address I no longer use was a Reagan.com e-mail service

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Normally, TB is smart enough to detect an attempt to open a second window and will 'kill' that request, BUT...

http://kb.mozillazine.org/Run_multiple_copies_of_Thunderbird_at_the_same_time

TB38.2 Win10-PC