nmap -p syntax question

Hi All,

On the nmap command line, some questions about the "-p"
parameter:

1) what is the "-p S:xxx".  What protocol is "S"?
    By change is it ICMP?

2) when you omitt the "T:" and/or the "U:" does it check
    both TCP and UDP.  What about the mysterious "S" protocol?
    Does it check that too?

3) is
        -p 137,138,139,445
    the same as
        -p U:137,138,139,445,T:137,138,139,445
    ?

Many thanks,
-T






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