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Changes to tip/536.md.

    20     20   
    21     21   # Specification and Documentation
    22     22   
    23     23   The following commands, which will all be documented in the **tk::mac** section of the Tk man page, will be added with this TIP: 
    24     24   
    25     25   ## ::tk::mac::PerformService
    26     26   
    27         -Executes a Tcl procedure called from the macOS "Services" menu by another application in the Apple menu item. The "Services" menu item allows for inter-application communication; data from one application, such as selected text, can be sent to another application for processing, for example to Safari as a search item for Google, or to TextEdit to be appended to a file. An example this procedure is below and should should be rewritten in an application script for customization, which will allow a Tk application to expose "Service" functionality to other programs: 
           27  +Executes a Tcl procedure called from the macOS "Services" menu by another application in the Apple menu item. The "Services" menu item allows for inter-application communication; data from one application, such as selected text, can be sent to another application for processing, for example to Safari as a search item for Google, or to TextEdit to be appended to a file. An example of this procedure, which will allow a Tk application to expose "Service" functionality to other programs (it should be customised in a application script; these are inherently non-generic): 
    28     28   
    29     29   	proc ::tk::mac::PerformService {} {
    30     30   		set w [text .t]
    31     31   		pack $w
    32     32   		set data [clipboard get]
    33     33   		$w insert end $data
    34     34   	}