How do you give a table a plain black 1px border.

If you're using css it would be:

table {border-width:1px; border-style:solid; border-color:#000000}

or the more compact

table {border:1px solid #000}

That will give all your tables the same border. If you only want to use that border on one or several tables you'll want to add either an id or a class to the specific tables.

Thanx, Can you use it for individual cells?

You can. You can use it on most any element you want not just tables. It may not work with rows though

or You can define another class for specific table cells, f.e.

td#plain {border-width:1px; border-style:solid; border-color:#000000}

and inside a page mark specific cells:

<td id=plain>cell inventory</td>