ExecInst 18: Tag value meaning

Imported from previous forum

We are trying to understand the business significance / exact meaning of the following tag 18 values of FIX. (some of them like All or None look obvious) Also are these flags exchange specific ?

ExecInst (tag18)
1 = Not held
2 = Work
3 = Go along
4 = Over the day
5 = Held
6 = Participate don’t initiate
7 = Strict scale
8 = Try to scale
9 = Stay on bidside
0 = Stay on offerside
A = No cross (cross is forbidden)
B = OK to cross
C = Call first
D = Percent of volume "(indicates that the sender does not want to be all
of the volume on the floor vs. a specific percentage)"
E = Do not increase - DNI
F = Do not reduce - DNR
G = All or none - AON
I = Institutions only
L = Last peg (last sale)
M = Mid-price peg (midprice of inside quote)
N = Non-negotiable
O = Opening peg
P = Market peg
R = Primary peg (primary market - buy at bid/sell at offer)
S = Suspend
T = Fixed Peg to Local best bid or offer at time of order
U = Customer Display Instruction (Rule11Ac1-1/4)
V = Netting (for Forex)
W = Peg to VWAP

In my opinion, some are exchange specific, some are region specific and some are sell-side support specific.

Regards,
Sunil Singh

Thanks Sunil.
But, any idea on the meaning of the Tag Values ?

In my opinion, some are exchange specific, some are region specific and
some are sell-side support specific.

Regards, Sunil Singh

You can find definitions to most of the tag 18 values in the Glossary of FIX 4.3 spec vol.1. Sites like http://www.investopedia.com/ are also a good place to look.

Thanks Sunil. But, any idea on the meaning of the Tag Values ?

In my opinion, some are exchange specific, some are region specific
and some are sell-side support specific.

Regards, Sunil Singh