Is it possible to trigger a previously defined salesforce action (for example Post) from a third party application outside of salesforce? I looked at the REST API and other interface documentation and could not find an example. If there is already a document which discusses this process, please provide the link or point me to the right place.
To make this question more specific, here is the use case requested: The user is in another application that tracks financials for a specific account. That account is lagging behind expected results. The finance person wants to add an action to the sales account owner / manager to make a call to this account. Rather than exiting the finance application and going to the Salesforce application to create the action item, we would like to initiate the action from the finance tool for an action to be created and tracked to completion in Salesforce. So, the action is already defined in SF. The finance app user would click a button in their current app. Enter the account information and the requested action information. That app would then handshake with SF and request the action be created using the information provided. Is that possible, and if so, what would be the process to create. (Is there already a knowledge base article or similar help that documents the general way to do this?)