How can a user easily pass dynamic parameters to a ProcessFlow Process

What version are you on and what access will your end user have?  The Process Trigger screen allows you to enter variable/value pairs that are accessible from within the flow.

Are you on S3 (4GL COBOL code)? If so and you're familiar with how to create custom 4GL programs then create a custom batch job that accepts parameters from the user. Then code the Procedure Division to prep the parameters and call the "1000-SEND-TO-BCI" paragraph that will start a particular flow and pass variables to it that are accessible via the "_inputData" variable.

Jason,
We are currently on Lawson 10.0.7.0.1361. I'm not sure if you need any other versions. We give our end users access to the Lawson application and Ming.le according to what they need. We could give additional access to users as needed. The hope would be to create a custom Form in Lawson or Ming.le that we could give necessary access to, that would contain 3 parameter fields and a Submit button.

I know there is a Trigger node in IPA. From what I see you can Trigger can start another Workflow process or a Service. I haven't figured out how that gets 3 parameters from a user into a Workflow.

Have you explored WFWK? I use that screen all the time (either as-is or customized via Design Studio), so users can call a Service with parameters.

Is there any documentation on the WFWK form. I have searched and found very little. I have gotten it to work and call a Process flow but there seems to be many options and I'd like to know how they work.