Fonts installed in the OS X native environment can be accessed by (a) any user or (b) just by an individual user. However, fonts installed in OS X system locations are not available to “Classic” applications (see section below).
Mac OS X has native support for Type 1 and OpenType fonts, which can be installed just like other font type on OS X. The fonts are now installed and will appear in the font menus of your applications.
The fonts located in that folder will appear below the folder’s name. Navigate to the folder that contains the fonts you want to install (if the fonts were wrapped in an installer, this may be in C:\temp\Adobe unless you told the installer to put them elsewhere).