[BioC] How to retrieve the genomic positions and /or orders of probes in the probe set

[szhan@uoguelph.ca]

Hello, Experts,
I have obtained single probe-level data from affybatch object (mydata)using the
script:
library(affy)
mydata<-ReadAffy()
mypm<-pm(mydata)
mymm<-mm(mydata)
myaffyids<-probeNames(mydata)
probedata<-data.frame(myaffyids, mypm, mymm)
Now I want to retrieve the genomic positions and/or orders of probes in each
probe set listed by myaffyids and add them to data frame( probedata).
Could you please help me out?
Thank you in advance!
Joshua