Learning vB Programming: What is |= ?

[Dax IX]

I'm having a heck of a time finding out what the operator |= is.

Google seems to ignore the | character.

What does |= mean?

It only seems to appear in the core code where Permissions are involved.

[Dave]

It's a bitwise operator.

$a | $b	Or (inclusive or)	Bits that are set in either $a or $b are set.

[Dax IX]

Thank you.

I think I'm finally starting to get how permissions are set (maybe).