This extension is a scripted implementation of the "ping" command for checking reachability/availability of Internet hosts.  You need to execute

load tclping.dll

in the TCL interpreter to make the ping function available.

ping hostname ?options?

options are

-ttl num
-tos num
-flags num
-count num
-timeout num
-simple
-size num

Clever use of these options can allow the creation of TCL based traceroute utilities, etc.