=> R0 = flags
R1 = pointer to 0 terminated URI
R2 = source task handle if b0 set, or 0 otherwise
<= R0 = return flags
R2 = task handle of URI handler
R3 = URI handle
This SWI is used by an application to check the validity of, or access a URI. The task will be informed of the result by wimp message URI_MReturnResult, or service call URI_ReturnResult.
URI_Dispatch flags
bit meaning if set
0 inform caller of result (R2 valid)
1 just check (b0 must be set), if unset process
2 don't attempt external process startup
3-31 reserved (must be 0)
URI_Dispatch return flags
bit meaning if set
0 request was rejected, URI won't be dispatched
1-31 reserved (must be 0)
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