Hi Thomas,
I have an Excel sheet with IP addresses. I would like to be able to
launch i.e telnet/or ssh against that IP

look at the shell-command in vba help.

when I doubleclick on the
cell.

I'd prefer a "go" button. You could connect a macro to that button with
the shell command. Otherwise you would need an event in the sheet
called "Worksheet_BeforeDoubleClick"

arno