This manual, as well as all other XPCE documentation both printed and online uses some notational conventions. Instead of speaking of `the send-method colour of class box', we write
`box->colour'
Similar, instead of `the get-method height of class window', we write
`window<-height'
In some cases, the arguments and/or the return type of the method are specified:
`box->colour: colour'
`window<-height -->int'