You're probably referring to the CTRL key, but it varies in different 
email programs. Thunderbird, for example, doesn't use the wheel at all, 
but uses CTRL +.

John Roberts wrote:
> There is a way to indrese or decrease the size of fonts in emailed mesages by using the wheel on the 
> mouse and something else.
> 
> Please tell me the way to do this as I have forgotten.
> 
> John Roberts
> 
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