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- CHECKCD.EXE is a small utility that determines whether there is a
- modem carrier on the specified communication port. Depending on
- the result, CHECKCD will exit with an error level. The returned
- error level can be used by batch files to do different things if
- there is a modem carrier or not. The syntax for CHECKCD.EXE is
- as follows: CHECKCD 1. If you use communication port 2,3 or 4,
- you would put a 2,3 or 4 where the one is. You do NOT put a COM
- in front of the number!
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