PGP can also sign and encrypt documents at the same time. Also, any major portal or search engine can be used to find other PGP web sites. Please use our links page, or use the search engines and portals, if you need more information. By knowing the content-type of a file, a program can know how to interpret the file. The web server tells the browser the content types of files used by the browser.
Most servers determine the content type based on the ending of the file name.
For example, files which end in .htm or .html are hypertext markup language files, and files which end in .pdf are portable document format files. When browsers read the files from disk, they also use file name endings to determine the content types. When the web server and browser are configured properly, and when a user clicks on a PGP file on a web page, then the browser will use the PGP software to interpret the file. Most servers do not recognize the three PGP content types listed above. To fix this, the server must be configured to recognize PGP content types.