Or remotely... 
telnet 127.0.0.1 80
HEAD / HTTP/1.1

[download]
(you should substitute an the ip address of the machine in interest for 127.0.0.1 in this example) The should reply something like 
HTTP/1.1 400 Bad Request
Date: Tue, 17 Sep 2002 23:32:19 GMT
Server: Apache/1.3.26 (Unix) Debian GNU/Linux mod_gzip/1.3.19.1a mod_p
+erl/1.27 DAV/1.0.3
Connection: close
Content-Type: text/html; charset=iso-8859-1

Connection to host lost.

[download]
Note the presence of something like mod_perl/1.27 says that mod_perl v1.27 is running in Apache.

In reply to Re: mod_perl: is it running? by blm
in thread mod_perl: is it running? by Anonymous Monk

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