In the config file: #!define KEYVALUE "key=s:value" modparam("pv", "varset", KEYVALUE) works. But if I try to use defexp or defexps the ID KEYVALUE is not set as expected and the parser complains. ## this doesn't parse #!defexp KEYVALUE2 "key=s:value" #!defexps KEYVALUE3 "key=s:value" # both these lead to syntax error modparam("pv", "varset", KEYVALUE2) modparam("pv", "varset", KEYVALUE3) Any ideas why defexp doesn't behave the same way here? Shih-Ping