Much appreciate your explanation.  I better understand now.   Thanks!

Please be more helpful.  Can you explain?  There is nothing in the manual that says how to install a package under an existing package.  And of course I don't want to mess up anything built in. 

with(ScientificConstants[Astronomy]):

GetConstant(M[Jupiter])
              mass_of_Jupiter , symbol=M_Jupiter , value= 1.90 10²⁷ , units=kg
etc...

If I build the package outside then I can't use the call GetConstant, I don't think.  But this is why I ask the question.
                

Please be more helpful.  Can you explain?  There is nothing in the manual that says how to install a package under an existing package.  And of course I don't want to mess up anything built in. 

with(ScientificConstants[Astronomy]):

GetConstant(M[Jupiter])
              mass_of_Jupiter , symbol=M_Jupiter , value= 1.90 10²⁷ , units=kg
etc...

If I build the package outside then I can't use the call GetConstant, I don't think.  But this is why I ask the question.
                

It appears Maple's internal loop calculation restricts isolve from producing values outside a 'rectangular box range'

Visualizing the issue

with(plots):
a:=6*x+2*y>=48:
b:=6*x+2*y<=72:

Solving for integer values in the region 

 ourrange := a, b, x >= 0, x <=12 , y >=0 , y <= 5:

isolve({ourrange})[3..]
                                   {x = 8, y = 0}, {x = 8, y = 1}, {x = 8, y = 2}, {x = 8, y = 3}, {x = 8, y = 4}, {x = 8, y = 5}, {x = 9, y = 0}, {x = 9, y = 1}, {x = 9, y = 2}, {x = 9, y = 3}, {x = 9, y = 4}, {x = 9, y = 5}, {x = 10, y = 0}, {x = 10, y = 1}, {x = 10, y = 2}, {x = 10, y = 3}, {x = 10, y = 4}, {x = 10, y = 5}

You'll also see in the answer (which I left out) at the beginning either warning solutions may have been lost (thrown up by M15) or some variation of y=_NN#~ (M12 )  M12 doesn't say solutions lost, but lets put the points given into a plot. 

xx := map(rhs, [isolve({ourrange})[3.., 1]]):
yy := map(rhs, [isolve({ourrange})[3.., 2]]):
zz := zip(`[]`, xx, yy):
zzz:=pointplot(zz):

aa := implicitplot(a, x = 0 .. 12, y = 0 .. 5, filledregions = true, transparency = .5):
bb := implicitplot(b, x = 0 .. 12, y = 0 .. 5, filledregions = true, transparency = .5):

display(aa,bb,zzz)

You can see which points have been missed, [11,0] , [11,1] , [11,2] , [12,0] , [12,1] , [7,3] , [7,4] , [7,5]  and  [6,5]

for a little better view, we'll change one inequality equation

a:=6*x+8*y>=48: #changing the 2 to 8
aa:=implicitplot(a,x=0..12,y=0..5,filledregions=true,transparency=.5):  # re-executing the aa plot
ourrange := a, b, x >= 0, x <= 12, y >=2 to y<=5:  # change the y range
#re-executing our points
xx := map(rhs, [isolve({ourrange})[3.., 1]]):
yy := map(rhs, [isolve({ourrange})[3.., 2]]):
zz := zip(`[]`, xx, yy):
zzz:=pointplot(zz):

display(aa,bb,zzz)

and we can see the rectangular selection behaviour a little easier.  Maybe Maple is supposed to do that but I don't think so, the isolve routine could be fixed. 

If I reduce the upper y search value I can see a little more

isolve({a, b, x >= 0, x<=10,y >= 0, y <= 3})
                    {y = _NN21}, {y = 3-_NN22}, {x = 8, y = 0}, {x = 8, y = 1}, {x = 8, y = 2}, {x = 8, y = 3}, {x = 9, y = 0}, {x = 9, y = 1}, {x = 9, y = 2}, {x = 9, y = 3}

But when I get to y<=4 I loose my x=9 solutions.

PasswordField is not available in Maple12.  How can I make something similar there?

I do not want circle symbols for each keypress.  I want to know how to replace with a random letter.  Is it possible in M12?  If not how would you modify the PasswordField code in newer versions to do just that?  I could possibly add the same procedure to the M12 library.  Would that work? 

I thought a simple maplet process was easy but I am finding it difficult to arrive at a solution.  The answer seems to be more complex than I thought.  Any thoughts?

PasswordField is not available in Maple12.  How can I make something similar there?

I do not want circle symbols for each keypress.  I want to know how to replace with a random letter.  Is it possible in M12?  If not how would you modify the PasswordField code in newer versions to do just that?  I could possibly add the same procedure to the M12 library.  Would that work? 

I thought a simple maplet process was easy but I am finding it difficult to arrive at a solution.  The answer seems to be more complex than I thought.  Any thoughts?

So either no one knows how, or it can't be done. 

How about this question instead... In a maplet create 2 text fields where the 2nd text field copies input from the first as you type (realtime copy so to speak).  I know how to do the copy when the focus changes but how about realtime?  Is it possible? 

I tried to see the differences between showstat(Maplets[Elements][TextField]) and showstat(Maplets[Elements][PasswordField]) but I could find none.  As far as I could tell both codes were exactly the same. 

I had access to a newer version of Maple and discovered Maplets[Elements][PasswordField] it is similar to what I am after and I thought it would hold a key to what I am after.

I used showstat but the code is long and I was unable to locate which part of the code could help me.  Anyone?

Okay so here's a bit of code, the idea was so that any onlookers couldn't read the input.

with(Maplets[Elements]):
maplet:=Maplet([["Enter string to be hashed:", BoxCell(TextBox['S1'](1 .. 32, foreground = white))], Button("OK", Shutdown(['S1']))]):
result:=Maplets[Display](maplet):
StringTools[Hash](result[1]);

The simplest way was to change the fontcolor to white so you can't see it, password hiding really, but the intention is to display different letters and not just *'s.

From a maplet in the standard GUI.

Say for example each character I push a different letter is displayed. 

@acer Yes, the m format file I am trying to look at is not mine.  Although using m files makes code faster, I suppose an unintended side effect of using m files is that the code remains slightly cryptic.

Although seeing that the m files are just a collection of assignment statements or procs the order is not that important.  I think using anames() before and after loading the m file and getting the differences should lead someone to find the important contents within the m file.  Originally I thought simply opening an m file would simply display the procs within the file.

(Unfortunately I was not reviewing the HYPERG question.)

To be more clear ... (thanks for anames)  Is there any way to extract the code from a .m file so I can see how it works?

I can use anames() to find out what commands are already available.  Then load the m file

read("g:/somefile.m")

then use anames() again to compare and see what new commands are available and use showtat() to examine some of the contents of the code. 

Is that generally what is done to explore and redesign files stored in a maple internal format?

Actually, probably, what I should have asked is how do I modify the contents of an .m file?

This is interesting.  It touches on, and could be extended to, cluster analysis.  Funnily enough, or sadly, the only two cluster analysis questions asked here in mapleprimes were by someone in 2006 (and it was never really answered) and by me which garnered zero response - of course a project I had started, abandoned and since dormant until now as we speak.