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Is the source code for the !Alarm application available .....
..... and if so, where?

The source for some versions of !Alarm will (probably) be available from RISCOS Open. For the versions bundled with RISC OS 4/6 you would need to be registered with RISCOS Ltd as being on the RISC OS development team.

OK. Thanks.

Perhaps it might be enough if somebody with access to the code (for RiscOS 4.2) can tell me what SWI it uses to get the its time .....

..... and what poll SWI it uses to keep the display updating every second.

The display being updated every second will be done with "Wimp_PollIdle". In BASIC I would expect something like:

SYS "Wimp_PollIdle",0,wimp_buffer%,polltime% TO r%

Where:

wimp_buffer% is our data block for receiving commands though the WIMP
polltime% is the time in centiseconds before we need to be polled again
r% is the action returned e.g. 1=Redraw Window 2=Open Window 3=Close window etc

There are several ways of reading the time on RISC OS machines. At it's most simple the BASIC reserved variable TIME$ (e.g. PRINT TIME$) will hold the correct time for when the variable is used.