Run App With One Param - opens second app and passes one input param value to it. The application which will be opened in this way can pick up the parameter by calling formula =input(parameter_name) after earlier adding an input parameter of the same name.
Where you can use action:
Post Workflow, Button
App Name (type: text) - name of the app to open; Examples:
if(1>10, APPNAME1, APPNAME2)
Param Name (type: text) - name of input parameter.
Param Value (type: depends on parameter type) - value of input parameter
Link target (type: Text) The place in which the app should open - can be either '_blank' which opens a new tab, or '_self' which opens the page on the current tab - it is set by default