FileScreen() - Read and display a file.
 Reads screen shot from a file and display to screen
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 Syntax

     FileScreen( <cFileName>, [<nOffset>]) --> nBytesRead

 Arguments

     <cFileName> is the name and path to the screen file.

     <nOffset> is an optional offset into the file from which a screen
     may be read. The default is the beginning of file.

 Returns

     FileScreen() returns the number of bytes read from the file.

 Description

     FileScreen() is used to read a screen stored in a disk file stored by
     using ScreenFile().

     <nOffset> may be use to get a particular screen if more than one screen
     has been stored in the file.

 Notes

     ■  Files may contain End-Of-File markers - these are ignored as
        FileScreen() always read in the number of bytes tht make up the
        current application window.

     ■  Wildcards are not permitted within filenames or paths.

     ■  This function does not alter the cursor position.

 Examples

     ■  Read a screen from the beginning of a file:

        FileScreen("C:\Screens\Demo1.Sht")

     ■  Read the second screen.  Since the offset is specified as
        4000, the first screen is skipped:

        FileScreen("C:\Screens\Demo1.Sht", 4000)


 Files:  Library is MRWINDOW.LIB.