$timerctl(REFNUMS) \ $timerctl(REFNUM <refnum>)
$timerctl(ADD <refnum> <interval> <events> <commands> <subargs> <window>) (NOT IMPLEMENTED YET)
$timerctl(DELETE <refnum>)
$timerctl(GET <refnum> <item>)
$timerctl(SET <refnum> <item> <value>)

• This function is a low-level interface to the client's timer system.
• The REFNUMS operation returns all of the timer names (refnums) that are currently pending, including any system timers that may not be visible from the /timer command.
• The REFNUM operation returns <refnum> if <refnum> is a pending timer.
• The ADD operation isn't implemented yet. Sorry.
• The DELETE operation removes a pending timer. It returns 0 on success, and the empty string if the timer doesn't exist or is a system timer.
• The GET/SET operators work by retreiving or setting attributes of the pending timers. The SET operator always returns the empty string, whether the operation succeeded or failed. The GET operator returns the empty string if the requested timer doesn't exist.

The GET num SERVER and GET num WINDOW attributes will return -1 if the window is not a server or window timer. Naturally if both return -1 then it is neither: it is a general timer by rule.

If you SET the SERVER or WINDOW value, it unconditionally turns the timer into a server or window timer, no matter what it was before.

You are never permitted to SET any value for system timers.

You should be able to set the CANCELABLE and FIRES attributes, but that isn't supported yet.

The $timerctl() function first appeared in EPIC4-1.1.8.