How to specify specific version etc. in yum

[Chris G]

The yum man page doesn't seem to say how to specify specific versions
of a package, it just says:-

    yum [options] [command] [package ...]

and expands on the options and command but not on the package.  How
does one specify a 32-bit or 64-bit package and how does one specify a
particular version (for example for removing an older version of a
package)?

-- 
Chris Green