remix-project/docs/udapp.md

Deployed contracts

This section in the Run tab contains a list of deployed contracts to interact with through autogenerated UI of the deployed contract (also called udapp).

Several cases apply:

• The called function is declared as constant or pure in Solidity. The action has a blue background, clicking it does not create a new transaction. Clicking it is not necessary because there are not state changes - but it will update the return value of the function.

-   The called function has no special keywords. The action has a
    light red background, clicking on does create a new transaction.
    But this transaction cannot accept any amount of Ether.

-   The called function is declared as `payable` in Solidity. The
    action has a red background, clicking it does create a new
    transaction and this transaction can accept value.

For more information about Solidity modifier, see Solidity modifier .

If a function requires input parameters, it is required to specify them.