How to solve WEB printing problems

Some webprinting has made a webpage a.htm ifrname  B .htmnow only needs to print B .htm content, and can be printed directly. (The print dialog box cannot be displayed. use windows. print (), the surface in (6.6) cannot .) the printed paper must be controlled during printing. WEB Printing
I made a web page a.htm, and ifrname included B .htm.
Now you only need to print the content in B .htm and print it directly. (The print dialog box cannot be displayed. use windows. print (), the surface in (6.6) cannot .) the printed paper must be controlled during printing. it is the kind of fake supermarket that prints small tickets. I don't know which senior person has implemented it .. hope to tell you .., some controls are found, which are charged. alas, no way. you can only seek help...

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The print dialog box does not pop up ==>> I want to know
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Can this PHP be implemented?
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This is implemented using C-write DEMO.
Let's take a look at the POS server.