Operand2 is the right operand. Operand2 can be any of the following:
The user-assigned A to Z and AA to ZZ collect vector variables. The collect vector variable can be either local or global.
The system-assigned A to Z and AA to ZZ vector variables, such as ani, asaiuui, and doy.
V1 to V9 VDN variables.
digits: The collected digits buffer for the call.
none.
A directly-entered numeric value.