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 AT - command prefix

 ATxxxx  Execute modem command "xxxx".

 All modem commands except "A/" and "+++" begin with the string "AT".
 You may give several commands on one line by stringing them together
 after the "AT".  Most modems have short command buffers and can only
 take command strings up to about 40 characters long.  Some commands,
 like "ATZ", cannot be followed by other commands.

 Example:

     SendModem(nPort, "ATE1Q0V1X1" + chr(13))