In relative dating, the temporal order of a sequence of events is determined, allowing the investigator to surmise whether a particular object or event is older or younger than, or occurred before or after, another object or event.
Pagers can be a royal PITA, and can be very much subject to interference I find (particularly if you carry multiple pagers). Internal telephones - they have capability for text messages as well as telephony and I'm sure you could programme them to activate as an emergency pager (loudspeaker message that would interrupt telephony as needed). Regrettably, it's not only cyber attacks that can cause havoc in NHS hospitals.
I had rare cause to visit an A&E Dept a couple of weeks ago, about 300 miles from home, and all systems were 'down', which I gathered was not an uncommon experience there, so no X-rays, let alone more seriously needed stuff.
Like many useful scripts, it was written quickly and has been in constant use ever since; becoming almost transparent it is so ingrained in my workflow.
The script allows me to manage the lag between when a company emails me an invoice and when the payment is actually due.
I just needed a script to make it painless to achieve.