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 Introduction    Serial Comunications
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 ComCarrier()    Determines if Carrier flag is on
 ComHighDTR()    Activates Data Terminal Ready flag
 ComInEmpt()     Determines if reception buffer is empty
 ComInFlh()      Initializes reception buffers
 ComInput()      Extracts a value from the comunications buffer (input)
 ComInputS()     Extracts a string from the comunications buffer (input str)
 ComInst()       Installs a Serial Comunications System
 ComLowDTR()     Deactivates Data Terminal Ready flag
 ComOutput()     Stuffs a value into the comunications buffer (output)
 ComOutputS()    Stuffs a string into the comunications buffer (output str)
 ComOutEmpt()    Determines if transmission buffer is empty
 ComOutFlh()     Initializes transmission buffers
 ComParity()     Determines comunication parity
 ComReady()      Determines if the system is ready to transmit
 ComSpeed()      Determines comunication speed
 ComUnInst()     Uninstalls Serial Comunications System
 CRC32()         Returns a CRC32 polynomial of a block as PKZIP
 Dial()          Dials a phone number through the modem
 Hangup()        Hangs up the phone