From the online help:
Copy the block of text between file positions
'p' and 'q' to the Windows clipboard (Win32 only).
The COLUMN, COLSET, LINESET, LINEBLOCK, RESET, DELETE and FILL options
can be used in the same way as for the Reg_Copy_Block( ) command.
Note: Only text should be copied to the clipboard.
Binary data should not be copied; the copy will be truncated at
the first Null character.