cmap to use a substitute command

Good Morning.

Vim 7.3.1-421 Windows 7 64-bit.

I want to create a command mode mapping which will do a substitution on
what is already typed in.
I am just wondering how to get access to the command line?

My searches through the help which was based on cmap and mapmode-c
didn't reveal anything I could use.

Thanks,
Dave

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