Standard front calls

Standard front call functions provide common utility APIs to control the front-end.

This table shows the functions implemented by the front-ends in the "standard" module, available on all front-ends.

Table 1. Standard front-end functions
Function Name	Description
`ui.Interface.frontCall("standard", "cbAdd", [text], [result])`	Adds to the content of the clipboard.
`ui.Interface.frontCall("standard", "cbClear", [], [result])`	Clears the content of the clipboard.
`ui.Interface.frontCall("standard", "cbGet", [], [text])`	Gets the content of the clipboard.
`ui.Interface.frontCall("standard", "cbPaste", [], [result])`	Pastes the content of the clipboard to the current field.
`ui.Interface.frontCall("standard", "cbSet", [text], [result])`	Set the content of the clipboard.
`ui.Interface.frontCall("standard", "execute", [cmd,wait], [result])`	Executes a command on the front-end platform, with or without waiting.
`ui.Interface.frontCall("standard", "feInfo", [name], [result])`	Queries general front-end properties.
`ui.Interface.frontCall("standard", "getEnv", [name], [value])`	Returns an environment variable set in the user session on the front end platform.
`ui.Interface.frontCall("standard", "hardCopy", [pgsize], [result])`	Prints a screenshot of the current window
`ui.Interface.frontCall("standard", "launchURL", [ url [, mode ] ], [] )`	Opens an URL with the default URL handler of the front-end.
`ui.Interface.frontCall("standard", "openDir", [path,caption], [result])`	Displays a file dialog window to get a directory path on the local file system.
`ui.Interface.frontCall("standard", "openFile", [path,name,wildcards,caption], [result])`	Displays a file dialog window to let the user select a single file path on the local file system.
`ui.Interface.frontCall("standard", "openFiles", [path,name,wildcards,caption], [result])`	Displays a file dialog window to let the user select a list of file paths on the local file system.
`ui.Interface.frontCall("standard", "playSound", [resource], [])`	Plays the sound file passed as parameter on the front-end platform.
`ui.Interface.frontCall("standard", "saveFile", [path,name,filetype,caption], [result])`	Displays a file dialog window to get a path to save a file on the local file system.