Capabilities of a TCL script in Cisco IOS

in CCNP
So I just came across this in the lab manual for CCNP ROUTE and curious to what can I do with this that would be useful aside from simultaneously pinging/tracert/ssh multiple devices?
:study:Reading: Lab Books, Ansible Documentation, Python Cookbook 2018 Goals: More Ansible/Python work for Automation, IPSpace Automation Course [X], Build Jenkins Framework for Network Automation []
Comments
Here is some more background info on it:
Cisco IOS Scripting with TCL Configuration Guide, Cisco IOS Release 12.4T - Cisco IOS Scripting with Tcl [Support] - Cisco
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