Not a Problem
Hi,
First I'd like to say that it's amazing what Geogebra can do and that it really helps me doing my work for school. But...
I would like to request that a new functions is added to the program:
1. Please make it possible to lock a point on a line (I'd really make things simpler)
Please consider it
Clara
The same problem 
For a line l you can define a point P=Poin(l) or using the Point tool on the toolbar click on the line to create a point that's draggable, but always stays on the line. Isn't this what you're asking for?
Creating a point on whatever existing object locks a point to that object.
chris
maybe you are looking for this:
Any movable point (on path or not on path) can be fixed.
.
or mor short: use this:
.
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