SendSystemKeys is not showing up in green

When I use this command in Advanced Scripting in the editing window it is not showing up in green color unlike the SendKeys command

Sends keystrokes to the Windows operating system. Use this command only when SendKeys fails to perform. You can use SendSystemKeys to send key combinations such as {Ctrl+Esc}, {Alt+Esc}, and {Alt+Tab}.

Syntax

SendSystemKeys "keystroke text"

Argument	Description
keystroke text	The keystrokes to be sent to the Windows operating system. Enclose the names of nonprinting keys in braces ({ }).

Example

This instruction executes the "Switch to Next Window" command.

SendSystemKeys "{Alt+Esc}"

Notes

• Do not include spaces between the names of simultaneously-pressed keys, such as Alt+Tab.
• Any modifier keys (SHIFT, CTRL, ALT) pressed while the SendSystemKeys command executes affect the command action.
• The SendSystemKeys command sends keystrokes more slowly than the SendKeys command. Also, if the system responds slowly long strings can overflow the system keyboard buffer.