What does the period '.' operator do in powershell?

Question

This is a weird one. Normally when I execute an external command from powershell I use the & operator like this:

& somecommand.exe -p so         


        

Answer 1

.Period or .full stop for an objects properties; like

$CompSys.TotalPhysicalMemory

See here: http://www.computerperformance.co.uk/powershell/powershell_syntax.htm#Operators_