getGroupMembers(group, recursive = FALSE, character = TRUE)
| group | the name of the group generic. | 
| recursive | a logical value. If TRUE, all the members of any intermediate group generic functions are returned recursively. If FALSE (the default), only the immediate group members are returned. | 
| character | a logical value. If TRUE (the default), the return value should be a character vector. If FALSE, the return value should be a list. | 
getGroupMembers("Arith")
# returns "+"  "-"  "*"  "^"  "%%"  "%/%"  "/"
getGroupMembers("Ops")
# returns "Arith"  "Compare"  "Logic"
getGroupMembers("Ops", recursive = TRUE)
# returns "Arith"  "Compare"  "Logic"  "+"  "-"  "*" ...
getGroupMembers("Arith", character = FALSE)
# returns a list of function names.