Minimum required version: 1.48

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The function of the pollword is now superseded by broadcast wimp messages.

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