property Params: TIdStrings;

Params is a read-only TStrings property... Params is a read-only TStrings property that contains parameters parsed from UnparsedParams using the parameter delimiter specified by the command handler. When the command handlers indicates that parameters should be parsed, each parameter is added to Params as an individual line. Otherwise, all parameters appear on a single line in Params. 

UnparsedParams can be used to access the parameter values before parsing was performed.