[BioC] Annotate Package: How do I get the gene names and how do I write my matrix

[S Peri]

Dear group, 

I did SAM, T-test analyses and obtained p-values. Now,
these files look like these:

T-test Values:

> Gli_X0_X1_pvals[1:5]
  100_g_at    1000_at    1001_at  1002_f_at  1003_s_at

0.80033009 0.31943016 0.33078591 0.05216239 0.08957325



Fold change(Avg. Diff):
> MyBrain_X0_X1_Exp_FCs[1:5]
 100_g_at   1000_at   1001_at 1002_f_at 1003_s_at 
1.0176023 0.9274588 0.8752550 1.1056984 1.1096023 


My question: 

Using annotation package how can I convert the probe
ID's to Gene names. how do i incorporate gene name in
place of 100_g_at?


2.  How can I choose/filter P-values from T-test that
are less than 0.01 to 0 ?


3. How can write the values into a table with 3
colnames:
Gene, P-value, Fold change

I am doing this for first time. Please help me. 

Thank you.

Regards, 
PS