Register client with PlayIt
| => | R0 = | 0 |
| R1 = | flags | |
| R2 = | event mask for poll word (if bit 1 of R1 set) |
| <= | R2 = | pointer to allocated poll word (if bit 1 of R1 set) |
| R1 bit | bit clear | bit set |
| bit 0 | Deregister quits PlayIt | Degregister doesn't quit PlayIt |
| bit 1 | - | Register poll word with mask in R2 (deprecated) |
The function of the pollword is now superseded by broadcast wimp messages.
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