=> R0 = Pointer to zero terminated filter name
R1 = Address of filter code
R2 = Value to be passed in R12
R3 = Task handle of task to which filter is applied or 0 for all tasks
<= all registers preserved
Adds a new pre-filter to the list of pre-filters.
Whenever the task with handle specified by R3 calls Wimp_Poll the address pointed to by R1 will be called, with R12 set to the value given in R2 when the filter was registered.
See PRM 3, page 306.
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