Using ``celldefine gives: `celldefine
Plain ``celldefine gives: `celldefine
Using `DEF1 gives: string1
Using ``DEF1 gives: "string1"
Plain ``DEF1 gives: "string1"
Using `DEF2 gives: string2"
Using ``DEF2 gives: "string2\""
Plain ``DEF2 gives: "string2\""
Using ``DEF3 gives: a\b
Plain ``DEF3 gives: a\b
Using ``DEF4("tmp") gives: "tmp"
Plain ``DEF4("tmp") gives: "tmp"