Xfsinfo is a utility for displaying information about an X font server. It is used to examine the capabilities of a server, the predefined values for various parameters used in communicating between clients and the server, and the font catalogues and alternate servers that are available.
The following shows a sample produced by xfsinfo.
name of server:    hansen:7100
version number:    1
vendor string:    Font Server Prototype
vendor release number:    17
maximum request size:    16384 longwords (65536 bytes)
number of catalogues:    1
    all
Number of alternate servers: 2
    #0    hansen:7101
    #1    hansen:7102
number of extensions:    0