MSTP is a valuable resource for technical writers and editors. You can download it from this site: http://www.tdrs-us.com/
It is listed there as MSTP.CHM
When you download it to your computer, it will be a zipped file.
When you unzip it and try to use it, if you see ‘Page not displayed’ or ‘Navigation to the web page was cancelled’, here’s what you do:
1. Right click the file and select ‘Properties’
2. Click Unblock
…And you have your handy reference manual.