(eplain.info)The \usepackage command

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4.23.1 The '\usepackage' command
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'\usepackage' loads a LaTeX package. Its syntax is similar to that of
LaTeX's '\usepackage' command:

     \usepackage[OPTIONS]{PACKAGES}[VERSION]

where OPTIONS is a comma-separated list of package options, PACKAGES is
a comma-separated list of packages to load (without the '.sty' suffix),
and VERSION is a package version number given as a date in the format
'YYYY/MM/DD'. If an older version of the package is found, a warning is
issued. If several packages are loaded within a single '\usepackage'
command, the OPTIONS will be applied to each of the packages. As usual,
parameters in square brackets are optional and can be omitted (together
with the square brackets).

   For example:

     \usepackage[foo,bar]{pack1,pack2}[2005/08/29]

will load packages 'pack1' and 'pack2', each with the options 'foo' and
'bar', and will check that each of the packages are dated 2005/08/29 or
newer.