http://www.purl.org/tcl/home/man/tcl8.4/TkCmd/grab.htm
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Programmers should be caution when issuing grabs.  This basically takes
control from the user, leaving them at the mercy of a program that might
not be operating as expected...

Not only that, but if the user needs for instance to copy and past data from another window, or needs to handle some emergency, and the app has issued a grab, the app is not going to be looked upon kindly.

[Joe English] wrote in [the comp.lang.tcl newsgroup]:

My two rules for [[grab -global]]: 

(1) don't use it unless I'm
absolutely sure I know what I'm doing, and 

(2) if I think I need it
this is a sure sign that I don't know what I'm doing :-)

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