Task/transaction Token By Logging

Hallo All,

I'm making in my DB some logs.
I have a separate table containing:
ID,
Date,
Source,
Type,
ErrorNo,
Description

Acctualy the table struct is not immportand that's why I do not post
the script.
I have one procedure, which I call in my other function procedures,
triggers etc. with parameters.
This procedure (WriteToLog) is called, if in other procedures, triggers
is any validation, exception or only information which I would like to
log me separately, and it writes the record into this table.

But sometimes, it is very hard, to follow much logs, and I figured out,
if I could have something like transaction ID, task ID, it will be much
easier.

Firs idea was to, by going from procedures to other procedures, pass a
self generated token (ie. date with any additional number). But then, I
need to change everywhere where I call WriteToLog procedure the call
syntax.

Let's say that we have following situation:

Procedure1:

Action1
Select1
CompareOfValues1
exec WriteToLog

Action2
CompareOfValues2
exec WriteToLog

Action3
exec Procedure2
Procedure2:
Action1
exec WriteToLog
Select1
Insert1
Trigger1Started:
Action1
CompareOfValues1
exec WriteToLog
Action2
Trigger1Exit:
Procedure2Exit:
Procedure1Exit:

Now ... I could pass this my generated number, from SP to SP and so on.
But I would like to now, does the MS SQL server has something what
identifies transaction like descripted below.

In this case, I do not need to pass any number, only I need to get this
number anyhow in SP WriteToLog, and insert it into my log table.
Any sugestions?

Thank's in advance.

Mateusz