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The Pluses of MH
Here are two ways plus signs (+) are used in MH:
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When you give the name of a folder to an
MH command, you type a
+ before the folder name, with no space between
them. An example is:
% folder +test
When an MH command tells you the current folder, it often puts
a + after the folder name. For example:
test+ has no messages.
In both cases, + is not part of the folder name.