Define a procedure parameter with a default value..
If you omit this parameter during the GOTO call, it will use its default value.
Can also be used with non local procedures.
param ?a = v
?a variable v default value
Source print (goto "calc") print (goto "calc", 5) print (goto "calc", 5, 4) label "calc" param ?a = 2 param ?b = 2 return ?a * ?bExecution 4 10 20