# quoted
D:\>pq "|"
(|)

# quoted ends in pair, which is treated as a literal " and a mode shift 
D:\>pq "|""
(|")

# ... which is observable here as the pipe is treated as a literl, this is
# semi-quoted-seperable mode.
D:\>pq "|"" |
(|")
(|)

# here we see that the lone quoted section in the second argument is 
# semit-quoted-inseperable. the space is literal but ...
D:\>pq "|"" " "
(|")
( )

# ... the special chars like pipe are not.
D:\>pq "|"" " |
The syntax of the command is incorrect.

# here we see that SQS reverts to SQI after the second lone quote.
D:\>pq "|"" " " |"
(|")
( )
(|)

# but it reverts to unquoted after a second double quote...
D:\>pq "|"" " "" |"
'"' is not recognized as an internal or external command,
operable program or batch file.

# ... which this demonstrates
D:\>pq "|"" " "" foo"
(|")
( ")
(foo)