visa resource symbol meaning

[jyang72211]

GPIB0::3::INSTR, GPIB1::1::INSTR, GPIB1::3::INSTR, and com1 have a symbol on their left.  What does it mean?  It looks like two little monitors to me.  Howcome some resources have a symbol and some don't?  

I don't have com1, GPIB1::1:INSTR, and GPIB 0:3::INSTR on my computer, but they showed up on the visia resource name, why is that?

[SteveChandler · Accepted solution]

You opened the ports but did not close them.

[jyang72211]

I didn't know about this.  This is such a good thing to know.