For Siena users, a little freeware "Plus pack".
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Items of interest:
CHARS.OPO lets you use special ASCII characters in the built-in applications
HOUR.OPO beeps the time in the dark
TREE.OPO gives you a readout of the files and their sizes on your disk
GUITAR.OPO is a guitar tuner utility
COMMUNIC.OPO is a Star-Trek-style 'Power-up' noise novelty
UNITS.SPR is a units conversion spreadsheet

Put the .OPO files in an \OPO\ directory and run from the "RunOPL"
system screen list. Put the .SPR file in a \SPR\ directory and open it
as normal in Sheet.

Steve Litchfield, March 1997
http://3lib.ukonline.co.uk/
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CHARS.OPO needs more explanation, as follows....

It's a modified version (with kind permission) of Tom Dolbilin's CHARM utility. 
Simply navigate to the character you need, then switch to the Psion app of your
choice and use "Bring" to import it directly! Pressing right-arrow immediately
afterwards clears the block highlight and lets you carry on typing etc.

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HOUR.OPO needs perhaps a bit more explanation, so here goes....

Following the excellent Timevoc utility for Psion 3a, with its
digitised voices and so forth, I decided I needed a similar facility
on my Siena. Except that it had to be tiny.

Thus this little app.

The scenario. You wake up in the middle of the night, 
disorientated, and need to know roughly what the time is. Trouble is,
your partner is sound asleep so you can't put a light on or get out
of bed etc. But you do have a Psion Siena handy. 

So, before going to sleep, remember to go into the HOUR.OPO program,
which will 'burp' softly according to the time of day and then turn
off, ready for action.

When you wake up in the night, simply press the "On" button
twice and the Siena will burp the number of hours, e.g. 3 burps
for a time between 3 and 4 am. It will then automatically turn off.

In the morning a simple X or Psion-X will exit the program and
return you to the system screen.

I hope you find this useful!