In a published work, when referencing a registered trademark name ( such as Microsoft Excel(r) ), do you have to put the "(r)" after EVERY mention of the word? Say you mention this same program 50 times throughout your publication, would you have to put the (r) mark after each instance?? Someone told me you only need it the first time, but I can't find any "law" either way. Thanks

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I THINK YOU MAKE 1 FOOTNOTE, --SUCH AND SUCH IS A REGISTERED TRADEMARK OF X CORP.

You would capitalize the trademark name, but you never have to tag it with a copyright designation, not even once. For confirmation of this, consult the "Chicago Manual of Style," available at your local library. The publisher of your work would have the final say on what appears in print. For MS preparation, your job is merely to be consistent in your references.

*YOU* don't have to put the (r) symbol anywhere. Your obligation is to to not make it appear that you are the source of Microsoft/Excel/Microsoft Excel. Microsoft, in their documentation, has to use the (r) to demonstrate that they are using these terms as trademarks and that they are protecting them as trademarks.