[TR] The -cursor option of many [Tk] widgets does not only allow to choose from the builtin [cursors] but also to used own creations. To accomplish this, you must specify the file, where the cursor lives:
 # windows:
 $widget configure -cursor "@path/to/cursorfile.cur"
 # unix:
 $widget configure -cursor "@path/to/cursorfile.xbm black"
So Windows takes a *.cur file and unix takes an *.xbm file and a color. On [unix] the cursor will be displayed in the size it was defined. Here is a 16x16 pixel cursor named hand.xbm:
 #define hand_width 16
 #define hand_height 16
 #define hand_x_hot 6
 #define hand_y_hot 0
 static unsigned char panPointer_bits[] = {
    0x00, 0x00, 0x80, 0x01, 0x58, 0x0e, 0x64, 0x12, 0x64, 0x52, 0x48, 0xb2,
    0x48, 0x92, 0x16, 0x90, 0x19, 0x80, 0x11, 0x40, 0x02, 0x40, 0x04, 0x40,
    0x04, 0x20, 0x08, 0x20, 0x10, 0x10, 0x20, 0x10 };
This file has two extra lines compared to "normal" xbm files that define where the so-called "hot spot" is. This is the point in the bitmap where a click event appears to come from. The coordinates count from left to right (x) and from top to bottom (y), just like the canvas coordinate system.

On [Windows] you should always create your cursor files with a size of 32x32 pixels even if you do not need so much space. If you created a 16x16 pixel cursor (as with unix above) it would get enlarged by a factor of two when displayed. A windows cursor file can easily be created from a bmp or gif file by the free Windows program IconShop [http://users.pandora.be/liontech/] (yes, it can also create windows icons). The only problem is, you cannot specify your own hotspot. But since the cur file format is known, we can do that with Tcl. Thus:
 set cur [open myCursorFile.cur r+]
 fconfigure $cur -encoding binary -translation binary
 # this is the file position of the x coord of the hot spot:
 seek $cur 10
 # set x=6
 puts -nonewline $cur [binary format c 6]
 # dto. for the y coord of the hot spot:
 seek $cur 12
 # set y=0
 puts -nonewline $cur [binary format c 0]
 close $cur
Now you have a nice cursor for your Unix and Windows programs.
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